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Finding the Fourth Proportional to 86,343.75, 129,509.69 and 53,068.95

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Solution

The fourth proportional to 86,343.75, 129,509.69 and 53,068.95 is: 79,599.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,343.75 : 129,509.69 = 53,068.95 : x
  2. Step 2: Convert to fraction form
    86,343.75/129,509.69 = 53,068.95/x
  3. Step 3: Cross multiply
    86,343.75x = 129,509.69 × 53,068.95
  4. Step 4: Simplify right side
    86,343.75x = 6,872,942,997.78
  5. Step 5: Solve for x
    x = 6,872,942,997.78/86,343.75
  6. Step 6: Final answer
    x = 79,599.77

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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.