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Finding the Fourth Proportional to 86,543.70, 129,718.35 and 36,615.30

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Solution

The fourth proportional to 86,543.70, 129,718.35 and 36,615.30 is: 54,881.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,543.70 : 129,718.35 = 36,615.30 : x
  2. Step 2: Convert to fraction form
    86,543.70/129,718.35 = 36,615.30/x
  3. Step 3: Cross multiply
    86,543.70x = 129,718.35 × 36,615.30
  4. Step 4: Simplify right side
    86,543.70x = 4,749,676,300.76
  5. Step 5: Solve for x
    x = 4,749,676,300.76/86,543.70
  6. Step 6: Final answer
    x = 54,881.83

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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.