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Finding the Fourth Proportional to 520.36, 717.78 and 354.76

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Solution

The fourth proportional to 520.36, 717.78 and 354.76 is: 489.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.36 : 717.78 = 354.76 : x
  2. Step 2: Convert to fraction form
    520.36/717.78 = 354.76/x
  3. Step 3: Cross multiply
    520.36x = 717.78 × 354.76
  4. Step 4: Simplify right side
    520.36x = 254,639.63
  5. Step 5: Solve for x
    x = 254,639.63/520.36
  6. Step 6: Final answer
    x = 489.35

Related Problems

Find fourth proportional to 260.18, 358.89 and 177.38
Half scale
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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.