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Finding the Fourth Proportional to 128,309.90, 177,060.48 and 70,945.89

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Solution

The fourth proportional to 128,309.90, 177,060.48 and 70,945.89 is: 97,901.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,309.90 : 177,060.48 = 70,945.89 : x
  2. Step 2: Convert to fraction form
    128,309.90/177,060.48 = 70,945.89/x
  3. Step 3: Cross multiply
    128,309.90x = 177,060.48 × 70,945.89
  4. Step 4: Simplify right side
    128,309.90x = 12,561,713,337.43
  5. Step 5: Solve for x
    x = 12,561,713,337.43/128,309.90
  6. Step 6: Final answer
    x = 97,901.36

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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.