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Finding the Fourth Proportional to 86,729.40, 129,875.40 and 69,233.40

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Solution

The fourth proportional to 86,729.40, 129,875.40 and 69,233.40 is: 103,675.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,729.40 : 129,875.40 = 69,233.40 : x
  2. Step 2: Convert to fraction form
    86,729.40/129,875.40 = 69,233.40/x
  3. Step 3: Cross multiply
    86,729.40x = 129,875.40 × 69,233.40
  4. Step 4: Simplify right side
    86,729.40x = 8,991,715,518.36
  5. Step 5: Solve for x
    x = 8,991,715,518.36/86,729.40
  6. Step 6: Final answer
    x = 103,675.52

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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.