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Finding the Fourth Proportional to 103,903.20, 155,854.80 and 81,784.80

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Solution

The fourth proportional to 103,903.20, 155,854.80 and 81,784.80 is: 122,677.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,903.20 : 155,854.80 = 81,784.80 : x
  2. Step 2: Convert to fraction form
    103,903.20/155,854.80 = 81,784.80/x
  3. Step 3: Cross multiply
    103,903.20x = 155,854.80 × 81,784.80
  4. Step 4: Simplify right side
    103,903.20x = 12,746,553,647.04
  5. Step 5: Solve for x
    x = 12,746,553,647.04/103,903.20
  6. Step 6: Final answer
    x = 122,677.20

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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.