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Finding the Fourth Proportional to 86,543.40, 129,669.30 and 42,074.40

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Solution

The fourth proportional to 86,543.40, 129,669.30 and 42,074.40 is: 63,040.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,543.40 : 129,669.30 = 42,074.40 : x
  2. Step 2: Convert to fraction form
    86,543.40/129,669.30 = 42,074.40/x
  3. Step 3: Cross multiply
    86,543.40x = 129,669.30 × 42,074.40
  4. Step 4: Simplify right side
    86,543.40x = 5,455,757,995.92
  5. Step 5: Solve for x
    x = 5,455,757,995.92/86,543.40
  6. Step 6: Final answer
    x = 63,040.72

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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.