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Finding the Fourth Proportional to 128,387.64, 177,199.46 and 86,020.04

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Solution

The fourth proportional to 128,387.64, 177,199.46 and 86,020.04 is: 118,724.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,387.64 : 177,199.46 = 86,020.04 : x
  2. Step 2: Convert to fraction form
    128,387.64/177,199.46 = 86,020.04/x
  3. Step 3: Cross multiply
    128,387.64x = 177,199.46 × 86,020.04
  4. Step 4: Simplify right side
    128,387.64x = 15,242,704,637.18
  5. Step 5: Solve for x
    x = 15,242,704,637.18/128,387.64
  6. Step 6: Final answer
    x = 118,724.08

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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.