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Finding the Fourth Proportional to 128,011.76, 176,664.72 and 71,424.36

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Solution

The fourth proportional to 128,011.76, 176,664.72 and 71,424.36 is: 98,570.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,011.76 : 176,664.72 = 71,424.36 : x
  2. Step 2: Convert to fraction form
    128,011.76/176,664.72 = 71,424.36/x
  3. Step 3: Cross multiply
    128,011.76x = 176,664.72 × 71,424.36
  4. Step 4: Simplify right side
    128,011.76x = 12,618,164,560.58
  5. Step 5: Solve for x
    x = 12,618,164,560.58/128,011.76
  6. Step 6: Final answer
    x = 98,570.35

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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.