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Finding the Fourth Proportional to 65,280.60, 97,920.90 and 20,908.80

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Solution

The fourth proportional to 65,280.60, 97,920.90 and 20,908.80 is: 31,363.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,280.60 : 97,920.90 = 20,908.80 : x
  2. Step 2: Convert to fraction form
    65,280.60/97,920.90 = 20,908.80/x
  3. Step 3: Cross multiply
    65,280.60x = 97,920.90 × 20,908.80
  4. Step 4: Simplify right side
    65,280.60x = 2,047,408,513.92
  5. Step 5: Solve for x
    x = 2,047,408,513.92/65,280.60
  6. Step 6: Final answer
    x = 31,363.20

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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.