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Finding the Fourth Proportional to 86,800.58, 129,988.55 and 78,386.10

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Solution

The fourth proportional to 86,800.58, 129,988.55 and 78,386.10 is: 117,387.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,800.58 : 129,988.55 = 78,386.10 : x
  2. Step 2: Convert to fraction form
    86,800.58/129,988.55 = 78,386.10/x
  3. Step 3: Cross multiply
    86,800.58x = 129,988.55 × 78,386.10
  4. Step 4: Simplify right side
    86,800.58x = 10,189,295,087.22
  5. Step 5: Solve for x
    x = 10,189,295,087.22/86,800.58
  6. Step 6: Final answer
    x = 117,387.41

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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.