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Finding the Fourth Proportional to 287,720.80, 431,613.60 and 88,039.60

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Solution

The fourth proportional to 287,720.80, 431,613.60 and 88,039.60 is: 132,069.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,720.80 : 431,613.60 = 88,039.60 : x
  2. Step 2: Convert to fraction form
    287,720.80/431,613.60 = 88,039.60/x
  3. Step 3: Cross multiply
    287,720.80x = 431,613.60 × 88,039.60
  4. Step 4: Simplify right side
    287,720.80x = 37,999,088,698.56
  5. Step 5: Solve for x
    x = 37,999,088,698.56/287,720.80
  6. Step 6: Final answer
    x = 132,069.31

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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.