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Finding the Fourth Proportional to 278,698.60, 418,023.60 and 91,710.10

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Solution

The fourth proportional to 278,698.60, 418,023.60 and 91,710.10 is: 137,557.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,698.60 : 418,023.60 = 91,710.10 : x
  2. Step 2: Convert to fraction form
    278,698.60/418,023.60 = 91,710.10/x
  3. Step 3: Cross multiply
    278,698.60x = 418,023.60 × 91,710.10
  4. Step 4: Simplify right side
    278,698.60x = 38,336,986,158.36
  5. Step 5: Solve for x
    x = 38,336,986,158.36/278,698.60
  6. Step 6: Final answer
    x = 137,557.15

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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.