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Finding the Fourth Proportional to 520.76, 718.11 and 450.78

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Solution

The fourth proportional to 520.76, 718.11 and 450.78 is: 621.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.76 : 718.11 = 450.78 : x
  2. Step 2: Convert to fraction form
    520.76/718.11 = 450.78/x
  3. Step 3: Cross multiply
    520.76x = 718.11 × 450.78
  4. Step 4: Simplify right side
    520.76x = 323,709.63
  5. Step 5: Solve for x
    x = 323,709.63/520.76
  6. Step 6: Final answer
    x = 621.62

Related Problems

Find fourth proportional to 260.38, 359.06 and 225.39
Half scale
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Double scale
Find fourth proportional to 521.76, 719.49 and 451.78
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.