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Finding the Fourth Proportional to 128,355.88, 177,115.71 and 70,987.42

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Solution

The fourth proportional to 128,355.88, 177,115.71 and 70,987.42 is: 97,954.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,355.88 : 177,115.71 = 70,987.42 : x
  2. Step 2: Convert to fraction form
    128,355.88/177,115.71 = 70,987.42/x
  3. Step 3: Cross multiply
    128,355.88x = 177,115.71 × 70,987.42
  4. Step 4: Simplify right side
    128,355.88x = 12,572,987,294.37
  5. Step 5: Solve for x
    x = 12,572,987,294.37/128,355.88
  6. Step 6: Final answer
    x = 97,954.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.