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Finding the Fourth Proportional to 71,187.80, 98,236.08 and 38,921.80

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Solution

The fourth proportional to 71,187.80, 98,236.08 and 38,921.80 is: 53,710.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,187.80 : 98,236.08 = 38,921.80 : x
  2. Step 2: Convert to fraction form
    71,187.80/98,236.08 = 38,921.80/x
  3. Step 3: Cross multiply
    71,187.80x = 98,236.08 × 38,921.80
  4. Step 4: Simplify right side
    71,187.80x = 3,823,525,058.54
  5. Step 5: Solve for x
    x = 3,823,525,058.54/71,187.80
  6. Step 6: Final answer
    x = 53,710.40

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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.