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Finding the Fourth Proportional to 520.32, 717.60 and 387.36

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Solution

The fourth proportional to 520.32, 717.60 and 387.36 is: 534.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.32 : 717.60 = 387.36 : x
  2. Step 2: Convert to fraction form
    520.32/717.60 = 387.36/x
  3. Step 3: Cross multiply
    520.32x = 717.60 × 387.36
  4. Step 4: Simplify right side
    520.32x = 277,969.54
  5. Step 5: Solve for x
    x = 277,969.54/520.32
  6. Step 6: Final answer
    x = 534.23

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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.