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Finding the Fourth Proportional to 86,515.80, 129,810.15 and 47,101.20

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Solution

The fourth proportional to 86,515.80, 129,810.15 and 47,101.20 is: 70,671.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,515.80 : 129,810.15 = 47,101.20 : x
  2. Step 2: Convert to fraction form
    86,515.80/129,810.15 = 47,101.20/x
  3. Step 3: Cross multiply
    86,515.80x = 129,810.15 × 47,101.20
  4. Step 4: Simplify right side
    86,515.80x = 6,114,213,837.18
  5. Step 5: Solve for x
    x = 6,114,213,837.18/86,515.80
  6. Step 6: Final answer
    x = 70,671.64

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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.