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Finding the Fourth Proportional to 42,420.60, 63,630.90 and 21,684.60

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Solution

The fourth proportional to 42,420.60, 63,630.90 and 21,684.60 is: 32,526.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,420.60 : 63,630.90 = 21,684.60 : x
  2. Step 2: Convert to fraction form
    42,420.60/63,630.90 = 21,684.60/x
  3. Step 3: Cross multiply
    42,420.60x = 63,630.90 × 21,684.60
  4. Step 4: Simplify right side
    42,420.60x = 1,379,810,614.14
  5. Step 5: Solve for x
    x = 1,379,810,614.14/42,420.60
  6. Step 6: Final answer
    x = 32,526.90

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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.