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Finding the Fourth Proportional to 128,070.66, 176,721.21 and 71,484.42

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Solution

The fourth proportional to 128,070.66, 176,721.21 and 71,484.42 is: 98,639.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,070.66 : 176,721.21 = 71,484.42 : x
  2. Step 2: Convert to fraction form
    128,070.66/176,721.21 = 71,484.42/x
  3. Step 3: Cross multiply
    128,070.66x = 176,721.21 × 71,484.42
  4. Step 4: Simplify right side
    128,070.66x = 12,632,813,198.55
  5. Step 5: Solve for x
    x = 12,632,813,198.55/128,070.66
  6. Step 6: Final answer
    x = 98,639.40

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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.