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Finding the Fourth Proportional to 71,540.78, 98,730.75 and 39,710.21

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Solution

The fourth proportional to 71,540.78, 98,730.75 and 39,710.21 is: 54,802.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,540.78 : 98,730.75 = 39,710.21 : x
  2. Step 2: Convert to fraction form
    71,540.78/98,730.75 = 39,710.21/x
  3. Step 3: Cross multiply
    71,540.78x = 98,730.75 × 39,710.21
  4. Step 4: Simplify right side
    71,540.78x = 3,920,618,322.30
  5. Step 5: Solve for x
    x = 3,920,618,322.30/71,540.78
  6. Step 6: Final answer
    x = 54,802.57

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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.