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Finding the Fourth Proportional to 128,670.66, 177,617.62 and 83,387.52

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Solution

The fourth proportional to 128,670.66, 177,617.62 and 83,387.52 is: 115,108.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,670.66 : 177,617.62 = 83,387.52 : x
  2. Step 2: Convert to fraction form
    128,670.66/177,617.62 = 83,387.52/x
  3. Step 3: Cross multiply
    128,670.66x = 177,617.62 × 83,387.52
  4. Step 4: Simplify right side
    128,670.66x = 14,811,092,840.10
  5. Step 5: Solve for x
    x = 14,811,092,840.10/128,670.66
  6. Step 6: Final answer
    x = 115,108.55

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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.