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Finding the Fourth Proportional to 103,789.19, 155,683.76 and 74,264.69

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Solution

The fourth proportional to 103,789.19, 155,683.76 and 74,264.69 is: 111,397.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,789.19 : 155,683.76 = 74,264.69 : x
  2. Step 2: Convert to fraction form
    103,789.19/155,683.76 = 74,264.69/x
  3. Step 3: Cross multiply
    103,789.19x = 155,683.76 × 74,264.69
  4. Step 4: Simplify right side
    103,789.19x = 11,561,805,024.69
  5. Step 5: Solve for x
    x = 11,561,805,024.69/103,789.19
  6. Step 6: Final answer
    x = 111,397.01

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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.