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Finding the Fourth Proportional to 603.40, 831.72 and 472.18

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Solution

The fourth proportional to 603.40, 831.72 and 472.18 is: 650.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.40 : 831.72 = 472.18 : x
  2. Step 2: Convert to fraction form
    603.40/831.72 = 472.18/x
  3. Step 3: Cross multiply
    603.40x = 831.72 × 472.18
  4. Step 4: Simplify right side
    603.40x = 392,721.55
  5. Step 5: Solve for x
    x = 392,721.55/603.40
  6. Step 6: Final answer
    x = 650.85

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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.