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Finding the Fourth Proportional to 86,672.10, 130,008.15 and 72,675.30

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Solution

The fourth proportional to 86,672.10, 130,008.15 and 72,675.30 is: 109,012.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,672.10 : 130,008.15 = 72,675.30 : x
  2. Step 2: Convert to fraction form
    86,672.10/130,008.15 = 72,675.30/x
  3. Step 3: Cross multiply
    86,672.10x = 130,008.15 × 72,675.30
  4. Step 4: Simplify right side
    86,672.10x = 9,448,381,303.70
  5. Step 5: Solve for x
    x = 9,448,381,303.70/86,672.10
  6. Step 6: Final answer
    x = 109,012.95

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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.