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Finding the Fourth Proportional to 128,368.48, 177,132.80 and 71,003.84

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Solution

The fourth proportional to 128,368.48, 177,132.80 and 71,003.84 is: 97,976.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,368.48 : 177,132.80 = 71,003.84 : x
  2. Step 2: Convert to fraction form
    128,368.48/177,132.80 = 71,003.84/x
  3. Step 3: Cross multiply
    128,368.48x = 177,132.80 × 71,003.84
  4. Step 4: Simplify right side
    128,368.48x = 12,577,108,989.95
  5. Step 5: Solve for x
    x = 12,577,108,989.95/128,368.48
  6. Step 6: Final answer
    x = 97,976.61

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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.