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Finding the Fourth Proportional to 45,759.20, 68,638.80 and 40,920.80

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Solution

The fourth proportional to 45,759.20, 68,638.80 and 40,920.80 is: 61,381.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,759.20 : 68,638.80 = 40,920.80 : x
  2. Step 2: Convert to fraction form
    45,759.20/68,638.80 = 40,920.80/x
  3. Step 3: Cross multiply
    45,759.20x = 68,638.80 × 40,920.80
  4. Step 4: Simplify right side
    45,759.20x = 2,808,754,607.04
  5. Step 5: Solve for x
    x = 2,808,754,607.04/45,759.20
  6. Step 6: Final answer
    x = 61,381.20

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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.