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Finding the Fourth Proportional to 71,109.79, 98,129.37 and 39,278.62

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Solution

The fourth proportional to 71,109.79, 98,129.37 and 39,278.62 is: 54,203.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,109.79 : 98,129.37 = 39,278.62 : x
  2. Step 2: Convert to fraction form
    71,109.79/98,129.37 = 39,278.62/x
  3. Step 3: Cross multiply
    71,109.79x = 98,129.37 × 39,278.62
  4. Step 4: Simplify right side
    71,109.79x = 3,854,386,235.07
  5. Step 5: Solve for x
    x = 3,854,386,235.07/71,109.79
  6. Step 6: Final answer
    x = 54,203.31

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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.