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Finding the Fourth Proportional to 913.74, 1,260.95 and 520.76

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Solution

The fourth proportional to 913.74, 1,260.95 and 520.76 is: 718.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.74 : 1,260.95 = 520.76 : x
  2. Step 2: Convert to fraction form
    913.74/1,260.95 = 520.76/x
  3. Step 3: Cross multiply
    913.74x = 1,260.95 × 520.76
  4. Step 4: Simplify right side
    913.74x = 656,652.32
  5. Step 5: Solve for x
    x = 656,652.32/913.74
  6. Step 6: Final answer
    x = 718.64

Related Problems

Find fourth proportional to 456.87, 630.48 and 260.38
Half scale
Find fourth proportional to 1,827.48, 2,521.90 and 1,041.52
Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.