Home / 42,519.60-63,781.68-12,938.40

Finding the Fourth Proportional to 42,519.60, 63,781.68 and 12,938.40

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Solution

The fourth proportional to 42,519.60, 63,781.68 and 12,938.40 is: 19,408.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,519.60 : 63,781.68 = 12,938.40 : x
  2. Step 2: Convert to fraction form
    42,519.60/63,781.68 = 12,938.40/x
  3. Step 3: Cross multiply
    42,519.60x = 63,781.68 × 12,938.40
  4. Step 4: Simplify right side
    42,519.60x = 825,232,888.51
  5. Step 5: Solve for x
    x = 825,232,888.51/42,519.60
  6. Step 6: Final answer
    x = 19,408.29

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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.