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Finding the Fourth Proportional to 86,656.30, 129,984.45 and 70,909.90

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Solution

The fourth proportional to 86,656.30, 129,984.45 and 70,909.90 is: 106,364.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,656.30 : 129,984.45 = 70,909.90 : x
  2. Step 2: Convert to fraction form
    86,656.30/129,984.45 = 70,909.90/x
  3. Step 3: Cross multiply
    86,656.30x = 129,984.45 × 70,909.90
  4. Step 4: Simplify right side
    86,656.30x = 9,217,184,351.06
  5. Step 5: Solve for x
    x = 9,217,184,351.06/86,656.30
  6. Step 6: Final answer
    x = 106,364.85

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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.