Home / 12,587.10-18,889.20-5,191.49

Finding the Fourth Proportional to 12,587.10, 18,889.20 and 5,191.49

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Solution

The fourth proportional to 12,587.10, 18,889.20 and 5,191.49 is: 7,790.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,587.10 : 18,889.20 = 5,191.49 : x
  2. Step 2: Convert to fraction form
    12,587.10/18,889.20 = 5,191.49/x
  3. Step 3: Cross multiply
    12,587.10x = 18,889.20 × 5,191.49
  4. Step 4: Simplify right side
    12,587.10x = 98,063,140.13
  5. Step 5: Solve for x
    x = 98,063,140.13/12,587.10
  6. Step 6: Final answer
    x = 7,790.77

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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.