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Finding the Fourth Proportional to 128,903.76, 177,888.56 and 71,544.15

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Solution

The fourth proportional to 128,903.76, 177,888.56 and 71,544.15 is: 98,731.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,903.76 : 177,888.56 = 71,544.15 : x
  2. Step 2: Convert to fraction form
    128,903.76/177,888.56 = 71,544.15/x
  3. Step 3: Cross multiply
    128,903.76x = 177,888.56 × 71,544.15
  4. Step 4: Simplify right side
    128,903.76x = 12,726,885,462.20
  5. Step 5: Solve for x
    x = 12,726,885,462.20/128,903.76
  6. Step 6: Final answer
    x = 98,731.69

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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.