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Finding the Fourth Proportional to 128,355.40, 192,565.54 and 103,620.20

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Solution

The fourth proportional to 128,355.40, 192,565.54 and 103,620.20 is: 155,456.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,355.40 : 192,565.54 = 103,620.20 : x
  2. Step 2: Convert to fraction form
    128,355.40/192,565.54 = 103,620.20/x
  3. Step 3: Cross multiply
    128,355.40x = 192,565.54 × 103,620.20
  4. Step 4: Simplify right side
    128,355.40x = 19,953,679,767.91
  5. Step 5: Solve for x
    x = 19,953,679,767.91/128,355.40
  6. Step 6: Final answer
    x = 155,456.49

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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.