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Finding the Fourth Proportional to 1,068.42, 1,472.94 and 831.63

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Solution

The fourth proportional to 1,068.42, 1,472.94 and 831.63 is: 1,146.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.42 : 1,472.94 = 831.63 : x
  2. Step 2: Convert to fraction form
    1,068.42/1,472.94 = 831.63/x
  3. Step 3: Cross multiply
    1,068.42x = 1,472.94 × 831.63
  4. Step 4: Simplify right side
    1,068.42x = 1,224,941.09
  5. Step 5: Solve for x
    x = 1,224,941.09/1,068.42
  6. Step 6: Final answer
    x = 1,146.50

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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.