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Finding the Fourth Proportional to 86,547.88, 129,821.82 and 69,128.43

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Solution

The fourth proportional to 86,547.88, 129,821.82 and 69,128.43 is: 103,692.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,547.88 : 129,821.82 = 69,128.43 : x
  2. Step 2: Convert to fraction form
    86,547.88/129,821.82 = 69,128.43/x
  3. Step 3: Cross multiply
    86,547.88x = 129,821.82 × 69,128.43
  4. Step 4: Simplify right side
    86,547.88x = 8,974,378,596.34
  5. Step 5: Solve for x
    x = 8,974,378,596.34/86,547.88
  6. Step 6: Final answer
    x = 103,692.65

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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.