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Finding the Fourth Proportional to 86,646.76, 129,789.02 and 69,688.10

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Solution

The fourth proportional to 86,646.76, 129,789.02 and 69,688.10 is: 104,386.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,646.76 : 129,789.02 = 69,688.10 : x
  2. Step 2: Convert to fraction form
    86,646.76/129,789.02 = 69,688.10/x
  3. Step 3: Cross multiply
    86,646.76x = 129,789.02 × 69,688.10
  4. Step 4: Simplify right side
    86,646.76x = 9,044,750,204.66
  5. Step 5: Solve for x
    x = 9,044,750,204.66/86,646.76
  6. Step 6: Final answer
    x = 104,386.48

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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.