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Finding the Fourth Proportional to 71,309.48, 98,407.86 and 39,478.91

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Solution

The fourth proportional to 71,309.48, 98,407.86 and 39,478.91 is: 54,481.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,309.48 : 98,407.86 = 39,478.91 : x
  2. Step 2: Convert to fraction form
    71,309.48/98,407.86 = 39,478.91/x
  3. Step 3: Cross multiply
    71,309.48x = 98,407.86 × 39,478.91
  4. Step 4: Simplify right side
    71,309.48x = 3,885,035,048.23
  5. Step 5: Solve for x
    x = 3,885,035,048.23/71,309.48
  6. Step 6: Final answer
    x = 54,481.33

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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.