Home / 42,005.40-63,008.10-12,420.60

Finding the Fourth Proportional to 42,005.40, 63,008.10 and 12,420.60

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Solution

The fourth proportional to 42,005.40, 63,008.10 and 12,420.60 is: 18,630.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,005.40 : 63,008.10 = 12,420.60 : x
  2. Step 2: Convert to fraction form
    42,005.40/63,008.10 = 12,420.60/x
  3. Step 3: Cross multiply
    42,005.40x = 63,008.10 × 12,420.60
  4. Step 4: Simplify right side
    42,005.40x = 782,598,406.86
  5. Step 5: Solve for x
    x = 782,598,406.86/42,005.40
  6. Step 6: Final answer
    x = 18,630.90

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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.