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Finding the Fourth Proportional to 86,307.72, 129,289.12 and 68,568.36

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Solution

The fourth proportional to 86,307.72, 129,289.12 and 68,568.36 is: 102,715.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,307.72 : 129,289.12 = 68,568.36 : x
  2. Step 2: Convert to fraction form
    86,307.72/129,289.12 = 68,568.36/x
  3. Step 3: Cross multiply
    86,307.72x = 129,289.12 × 68,568.36
  4. Step 4: Simplify right side
    86,307.72x = 8,865,142,924.24
  5. Step 5: Solve for x
    x = 8,865,142,924.24/86,307.72
  6. Step 6: Final answer
    x = 102,715.53

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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.