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Finding the Fourth Proportional to 128,245.41, 176,978.30 and 71,656.83

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Solution

The fourth proportional to 128,245.41, 176,978.30 and 71,656.83 is: 98,886.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,245.41 : 176,978.30 = 71,656.83 : x
  2. Step 2: Convert to fraction form
    128,245.41/176,978.30 = 71,656.83/x
  3. Step 3: Cross multiply
    128,245.41x = 176,978.30 × 71,656.83
  4. Step 4: Simplify right side
    128,245.41x = 12,681,703,598.50
  5. Step 5: Solve for x
    x = 12,681,703,598.50/128,245.41
  6. Step 6: Final answer
    x = 98,886.22

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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.