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Finding the Fourth Proportional to 128,251.79, 176,987.08 and 71,663.21

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Solution

The fourth proportional to 128,251.79, 176,987.08 and 71,663.21 is: 98,895.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,251.79 : 176,987.08 = 71,663.21 : x
  2. Step 2: Convert to fraction form
    128,251.79/176,987.08 = 71,663.21/x
  3. Step 3: Cross multiply
    128,251.79x = 176,987.08 × 71,663.21
  4. Step 4: Simplify right side
    128,251.79x = 12,683,462,281.33
  5. Step 5: Solve for x
    x = 12,683,462,281.33/128,251.79
  6. Step 6: Final answer
    x = 98,895.01

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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.