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Finding the Fourth Proportional to 86,985.70, 130,118.10 and 81,672.10

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Solution

The fourth proportional to 86,985.70, 130,118.10 and 81,672.10 is: 122,169.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,985.70 : 130,118.10 = 81,672.10 : x
  2. Step 2: Convert to fraction form
    86,985.70/130,118.10 = 81,672.10/x
  3. Step 3: Cross multiply
    86,985.70x = 130,118.10 × 81,672.10
  4. Step 4: Simplify right side
    86,985.70x = 10,627,018,475.01
  5. Step 5: Solve for x
    x = 10,627,018,475.01/86,985.70
  6. Step 6: Final answer
    x = 122,169.72

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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.