Home / 42,138.12-63,207.16-12,555.20

Finding the Fourth Proportional to 42,138.12, 63,207.16 and 12,555.20

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Solution

The fourth proportional to 42,138.12, 63,207.16 and 12,555.20 is: 18,832.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,138.12 : 63,207.16 = 12,555.20 : x
  2. Step 2: Convert to fraction form
    42,138.12/63,207.16 = 12,555.20/x
  3. Step 3: Cross multiply
    42,138.12x = 63,207.16 × 12,555.20
  4. Step 4: Simplify right side
    42,138.12x = 793,578,535.23
  5. Step 5: Solve for x
    x = 793,578,535.23/42,138.12
  6. Step 6: Final answer
    x = 18,832.79

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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.