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Finding the Fourth Proportional to 278,868.60, 418,302.90 and 91,855.80

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Solution

The fourth proportional to 278,868.60, 418,302.90 and 91,855.80 is: 137,783.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,868.60 : 418,302.90 = 91,855.80 : x
  2. Step 2: Convert to fraction form
    278,868.60/418,302.90 = 91,855.80/x
  3. Step 3: Cross multiply
    278,868.60x = 418,302.90 × 91,855.80
  4. Step 4: Simplify right side
    278,868.60x = 38,423,547,521.82
  5. Step 5: Solve for x
    x = 38,423,547,521.82/278,868.60
  6. Step 6: Final answer
    x = 137,783.70

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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.