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Finding the Fourth Proportional to 99,139.74, 136,866.15 and 76,428.96

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Solution

The fourth proportional to 99,139.74, 136,866.15 and 76,428.96 is: 105,513.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,139.74 : 136,866.15 = 76,428.96 : x
  2. Step 2: Convert to fraction form
    99,139.74/136,866.15 = 76,428.96/x
  3. Step 3: Cross multiply
    99,139.74x = 136,866.15 × 76,428.96
  4. Step 4: Simplify right side
    99,139.74x = 10,460,537,503.70
  5. Step 5: Solve for x
    x = 10,460,537,503.70/99,139.74
  6. Step 6: Final answer
    x = 105,513.06

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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.