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Finding the Fourth Proportional to 128,648.20, 177,534.51 and 78,347.20

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Solution

The fourth proportional to 128,648.20, 177,534.51 and 78,347.20 is: 108,119.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,648.20 : 177,534.51 = 78,347.20 : x
  2. Step 2: Convert to fraction form
    128,648.20/177,534.51 = 78,347.20/x
  3. Step 3: Cross multiply
    128,648.20x = 177,534.51 × 78,347.20
  4. Step 4: Simplify right side
    128,648.20x = 13,909,331,761.87
  5. Step 5: Solve for x
    x = 13,909,331,761.87/128,648.20
  6. Step 6: Final answer
    x = 108,119.13

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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.