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Finding the Fourth Proportional to 752.67, 1,038.78 and 457.92

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Solution

The fourth proportional to 752.67, 1,038.78 and 457.92 is: 631.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.67 : 1,038.78 = 457.92 : x
  2. Step 2: Convert to fraction form
    752.67/1,038.78 = 457.92/x
  3. Step 3: Cross multiply
    752.67x = 1,038.78 × 457.92
  4. Step 4: Simplify right side
    752.67x = 475,678.14
  5. Step 5: Solve for x
    x = 475,678.14/752.67
  6. Step 6: Final answer
    x = 631.99

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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.