Home / 78,437.20-117,655.80-19,272.10

Finding the Fourth Proportional to 78,437.20, 117,655.80 and 19,272.10

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Solution

The fourth proportional to 78,437.20, 117,655.80 and 19,272.10 is: 28,908.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,437.20 : 117,655.80 = 19,272.10 : x
  2. Step 2: Convert to fraction form
    78,437.20/117,655.80 = 19,272.10/x
  3. Step 3: Cross multiply
    78,437.20x = 117,655.80 × 19,272.10
  4. Step 4: Simplify right side
    78,437.20x = 2,267,474,343.18
  5. Step 5: Solve for x
    x = 2,267,474,343.18/78,437.20
  6. Step 6: Final answer
    x = 28,908.15

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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.