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Finding the Fourth Proportional to 128,353.88, 177,112.95 and 70,985.42

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Solution

The fourth proportional to 128,353.88, 177,112.95 and 70,985.42 is: 97,951.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,353.88 : 177,112.95 = 70,985.42 : x
  2. Step 2: Convert to fraction form
    128,353.88/177,112.95 = 70,985.42/x
  3. Step 3: Cross multiply
    128,353.88x = 177,112.95 × 70,985.42
  4. Step 4: Simplify right side
    128,353.88x = 12,572,436,257.62
  5. Step 5: Solve for x
    x = 12,572,436,257.62/128,353.88
  6. Step 6: Final answer
    x = 97,951.36

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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.