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Finding the Fourth Proportional to 128,706.12, 177,615.54 and 71,346.66

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Solution

The fourth proportional to 128,706.12, 177,615.54 and 71,346.66 is: 98,459.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,706.12 : 177,615.54 = 71,346.66 : x
  2. Step 2: Convert to fraction form
    128,706.12/177,615.54 = 71,346.66/x
  3. Step 3: Cross multiply
    128,706.12x = 177,615.54 × 71,346.66
  4. Step 4: Simplify right side
    128,706.12x = 12,672,275,543.10
  5. Step 5: Solve for x
    x = 12,672,275,543.10/128,706.12
  6. Step 6: Final answer
    x = 98,459.00

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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.