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Finding the Fourth Proportional to 60,438.80, 90,636.60 and 20,997.20

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Solution

The fourth proportional to 60,438.80, 90,636.60 and 20,997.20 is: 31,488.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,438.80 : 90,636.60 = 20,997.20 : x
  2. Step 2: Convert to fraction form
    60,438.80/90,636.60 = 20,997.20/x
  3. Step 3: Cross multiply
    60,438.80x = 90,636.60 × 20,997.20
  4. Step 4: Simplify right side
    60,438.80x = 1,903,114,817.52
  5. Step 5: Solve for x
    x = 1,903,114,817.52/60,438.80
  6. Step 6: Final answer
    x = 31,488.30

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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.