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Finding the Fourth Proportional to 128,299.67, 177,058.95 and 71,711

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Solution

The fourth proportional to 128,299.67, 177,058.95 and 71,711 is: 98,964.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,299.67 : 177,058.95 = 71,711 : x
  2. Step 2: Convert to fraction form
    128,299.67/177,058.95 = 71,711/x
  3. Step 3: Cross multiply
    128,299.67x = 177,058.95 × 71,711
  4. Step 4: Simplify right side
    128,299.67x = 12,697,074,363.45
  5. Step 5: Solve for x
    x = 12,697,074,363.45/128,299.67
  6. Step 6: Final answer
    x = 98,964.20

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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.