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Finding the Fourth Proportional to 71,675.42, 98,912.75 and 39,411.70

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Solution

The fourth proportional to 71,675.42, 98,912.75 and 39,411.70 is: 54,388.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,675.42 : 98,912.75 = 39,411.70 : x
  2. Step 2: Convert to fraction form
    71,675.42/98,912.75 = 39,411.70/x
  3. Step 3: Cross multiply
    71,675.42x = 98,912.75 × 39,411.70
  4. Step 4: Simplify right side
    71,675.42x = 3,898,319,184.83
  5. Step 5: Solve for x
    x = 3,898,319,184.83/71,675.42
  6. Step 6: Final answer
    x = 54,388.51

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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.