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Finding the Fourth Proportional to 86,611.10, 129,916.65 and 42,266.30

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Solution

The fourth proportional to 86,611.10, 129,916.65 and 42,266.30 is: 63,399.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,611.10 : 129,916.65 = 42,266.30 : x
  2. Step 2: Convert to fraction form
    86,611.10/129,916.65 = 42,266.30/x
  3. Step 3: Cross multiply
    86,611.10x = 129,916.65 × 42,266.30
  4. Step 4: Simplify right side
    86,611.10x = 5,491,096,103.90
  5. Step 5: Solve for x
    x = 5,491,096,103.90/86,611.10
  6. Step 6: Final answer
    x = 63,399.45

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1.5x scale

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.