Home / 20,580.78-28,386.75-13,397.47

Finding the Fourth Proportional to 20,580.78, 28,386.75 and 13,397.47

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Solution

The fourth proportional to 20,580.78, 28,386.75 and 13,397.47 is: 18,478.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,580.78 : 28,386.75 = 13,397.47 : x
  2. Step 2: Convert to fraction form
    20,580.78/28,386.75 = 13,397.47/x
  3. Step 3: Cross multiply
    20,580.78x = 28,386.75 × 13,397.47
  4. Step 4: Simplify right side
    20,580.78x = 380,310,610.80
  5. Step 5: Solve for x
    x = 380,310,610.80/20,580.78
  6. Step 6: Final answer
    x = 18,478.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.