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Finding the Fourth Proportional to 71,611.56, 98,820.60 and 39,782.40

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Solution

The fourth proportional to 71,611.56, 98,820.60 and 39,782.40 is: 54,897.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,611.56 : 98,820.60 = 39,782.40 : x
  2. Step 2: Convert to fraction form
    71,611.56/98,820.60 = 39,782.40/x
  3. Step 3: Cross multiply
    71,611.56x = 98,820.60 × 39,782.40
  4. Step 4: Simplify right side
    71,611.56x = 3,931,320,637.44
  5. Step 5: Solve for x
    x = 3,931,320,637.44/71,611.56
  6. Step 6: Final answer
    x = 54,897.85

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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.