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Finding the Fourth Proportional to 85,405.80, 127,935.90 and 59,140.20

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Solution

The fourth proportional to 85,405.80, 127,935.90 and 59,140.20 is: 88,590.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,405.80 : 127,935.90 = 59,140.20 : x
  2. Step 2: Convert to fraction form
    85,405.80/127,935.90 = 59,140.20/x
  3. Step 3: Cross multiply
    85,405.80x = 127,935.90 × 59,140.20
  4. Step 4: Simplify right side
    85,405.80x = 7,566,154,713.18
  5. Step 5: Solve for x
    x = 7,566,154,713.18/85,405.80
  6. Step 6: Final answer
    x = 88,590.64

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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.