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Finding the Fourth Proportional to 71,648.90, 98,870.96 and 39,815.90

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Solution

The fourth proportional to 71,648.90, 98,870.96 and 39,815.90 is: 54,943.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,648.90 : 98,870.96 = 39,815.90 : x
  2. Step 2: Convert to fraction form
    71,648.90/98,870.96 = 39,815.90/x
  3. Step 3: Cross multiply
    71,648.90x = 98,870.96 × 39,815.90
  4. Step 4: Simplify right side
    71,648.90x = 3,936,636,256.26
  5. Step 5: Solve for x
    x = 3,936,636,256.26/71,648.90
  6. Step 6: Final answer
    x = 54,943.43

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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.