Home / 20,570.86-28,387.80-11,139.46

Finding the Fourth Proportional to 20,570.86, 28,387.80 and 11,139.46

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Solution

The fourth proportional to 20,570.86, 28,387.80 and 11,139.46 is: 15,372.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,570.86 : 28,387.80 = 11,139.46 : x
  2. Step 2: Convert to fraction form
    20,570.86/28,387.80 = 11,139.46/x
  3. Step 3: Cross multiply
    20,570.86x = 28,387.80 × 11,139.46
  4. Step 4: Simplify right side
    20,570.86x = 316,224,762.59
  5. Step 5: Solve for x
    x = 316,224,762.59/20,570.86
  6. Step 6: Final answer
    x = 15,372.46

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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.