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Finding the Fourth Proportional to 61,990.80, 92,986.20 and 20,432.40

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Solution

The fourth proportional to 61,990.80, 92,986.20 and 20,432.40 is: 30,648.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,990.80 : 92,986.20 = 20,432.40 : x
  2. Step 2: Convert to fraction form
    61,990.80/92,986.20 = 20,432.40/x
  3. Step 3: Cross multiply
    61,990.80x = 92,986.20 × 20,432.40
  4. Step 4: Simplify right side
    61,990.80x = 1,899,931,232.88
  5. Step 5: Solve for x
    x = 1,899,931,232.88/61,990.80
  6. Step 6: Final answer
    x = 30,648.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.