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Finding the Fourth Proportional to 972.33, 1,457.91 and 387.43

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Solution

The fourth proportional to 972.33, 1,457.91 and 387.43 is: 580.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.33 : 1,457.91 = 387.43 : x
  2. Step 2: Convert to fraction form
    972.33/1,457.91 = 387.43/x
  3. Step 3: Cross multiply
    972.33x = 1,457.91 × 387.43
  4. Step 4: Simplify right side
    972.33x = 564,831.75
  5. Step 5: Solve for x
    x = 564,831.75/972.33
  6. Step 6: Final answer
    x = 580.90

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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.