Home / 42,078.40-63,117.60-21,299.20

Finding the Fourth Proportional to 42,078.40, 63,117.60 and 21,299.20

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Solution

The fourth proportional to 42,078.40, 63,117.60 and 21,299.20 is: 31,948.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,078.40 : 63,117.60 = 21,299.20 : x
  2. Step 2: Convert to fraction form
    42,078.40/63,117.60 = 21,299.20/x
  3. Step 3: Cross multiply
    42,078.40x = 63,117.60 × 21,299.20
  4. Step 4: Simplify right side
    42,078.40x = 1,344,354,385.92
  5. Step 5: Solve for x
    x = 1,344,354,385.92/42,078.40
  6. Step 6: Final answer
    x = 31,948.80

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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.