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Finding the Fourth Proportional to 717.71, 1,075.12 and 428.99

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Solution

The fourth proportional to 717.71, 1,075.12 and 428.99 is: 642.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.71 : 1,075.12 = 428.99 : x
  2. Step 2: Convert to fraction form
    717.71/1,075.12 = 428.99/x
  3. Step 3: Cross multiply
    717.71x = 1,075.12 × 428.99
  4. Step 4: Simplify right side
    717.71x = 461,209.28
  5. Step 5: Solve for x
    x = 461,209.28/717.71
  6. Step 6: Final answer
    x = 642.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.