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Finding the Fourth Proportional to 128,250.79, 176,985.71 and 71,662.21

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Solution

The fourth proportional to 128,250.79, 176,985.71 and 71,662.21 is: 98,893.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,250.79 : 176,985.71 = 71,662.21 : x
  2. Step 2: Convert to fraction form
    128,250.79/176,985.71 = 71,662.21/x
  3. Step 3: Cross multiply
    128,250.79x = 176,985.71 × 71,662.21
  4. Step 4: Simplify right side
    128,250.79x = 12,683,185,873.78
  5. Step 5: Solve for x
    x = 12,683,185,873.78/128,250.79
  6. Step 6: Final answer
    x = 98,893.63

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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.