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Finding the Fourth Proportional to 84,003.80, 126,005.70 and 42,013.40

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Solution

The fourth proportional to 84,003.80, 126,005.70 and 42,013.40 is: 63,020.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,003.80 : 126,005.70 = 42,013.40 : x
  2. Step 2: Convert to fraction form
    84,003.80/126,005.70 = 42,013.40/x
  3. Step 3: Cross multiply
    84,003.80x = 126,005.70 × 42,013.40
  4. Step 4: Simplify right side
    84,003.80x = 5,293,927,876.38
  5. Step 5: Solve for x
    x = 5,293,927,876.38/84,003.80
  6. Step 6: Final answer
    x = 63,020.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.