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Finding the Fourth Proportional to 128,267.40, 177,008.50 and 71,678.76

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Solution

The fourth proportional to 128,267.40, 177,008.50 and 71,678.76 is: 98,916.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,267.40 : 177,008.50 = 71,678.76 : x
  2. Step 2: Convert to fraction form
    128,267.40/177,008.50 = 71,678.76/x
  3. Step 3: Cross multiply
    128,267.40x = 177,008.50 × 71,678.76
  4. Step 4: Simplify right side
    128,267.40x = 12,687,749,789.46
  5. Step 5: Solve for x
    x = 12,687,749,789.46/128,267.40
  6. Step 6: Final answer
    x = 98,916.40

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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.