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Finding the Fourth Proportional to 99,988.69, 138,019.14 and 57,564.13

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Solution

The fourth proportional to 99,988.69, 138,019.14 and 57,564.13 is: 79,458.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,988.69 : 138,019.14 = 57,564.13 : x
  2. Step 2: Convert to fraction form
    99,988.69/138,019.14 = 57,564.13/x
  3. Step 3: Cross multiply
    99,988.69x = 138,019.14 × 57,564.13
  4. Step 4: Simplify right side
    99,988.69x = 7,944,951,717.45
  5. Step 5: Solve for x
    x = 7,944,951,717.45/99,988.69
  6. Step 6: Final answer
    x = 79,458.50

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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.