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Finding the Fourth Proportional to 103,772.20, 155,658.30 and 61,781.80

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Solution

The fourth proportional to 103,772.20, 155,658.30 and 61,781.80 is: 92,672.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,772.20 : 155,658.30 = 61,781.80 : x
  2. Step 2: Convert to fraction form
    103,772.20/155,658.30 = 61,781.80/x
  3. Step 3: Cross multiply
    103,772.20x = 155,658.30 × 61,781.80
  4. Step 4: Simplify right side
    103,772.20x = 9,616,849,958.94
  5. Step 5: Solve for x
    x = 9,616,849,958.94/103,772.20
  6. Step 6: Final answer
    x = 92,672.70

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1.5x scale

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.