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Finding the Fourth Proportional to 287,279.10, 430,918.65 and 74,046.60

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Solution

The fourth proportional to 287,279.10, 430,918.65 and 74,046.60 is: 111,069.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,279.10 : 430,918.65 = 74,046.60 : x
  2. Step 2: Convert to fraction form
    287,279.10/430,918.65 = 74,046.60/x
  3. Step 3: Cross multiply
    287,279.10x = 430,918.65 × 74,046.60
  4. Step 4: Simplify right side
    287,279.10x = 31,908,060,909.09
  5. Step 5: Solve for x
    x = 31,908,060,909.09/287,279.10
  6. Step 6: Final answer
    x = 111,069.90

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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.