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Finding the Fourth Proportional to 287,645.60, 431,986.80 and 278,314.40

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Solution

The fourth proportional to 287,645.60, 431,986.80 and 278,314.40 is: 417,973.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,645.60 : 431,986.80 = 278,314.40 : x
  2. Step 2: Convert to fraction form
    287,645.60/431,986.80 = 278,314.40/x
  3. Step 3: Cross multiply
    287,645.60x = 431,986.80 × 278,314.40
  4. Step 4: Simplify right side
    287,645.60x = 120,228,147,049.92
  5. Step 5: Solve for x
    x = 120,228,147,049.92/287,645.60
  6. Step 6: Final answer
    x = 417,973.18

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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.