Home / 20,678.80-28,541.28-13,605.88

Finding the Fourth Proportional to 20,678.80, 28,541.28 and 13,605.88

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Solution

The fourth proportional to 20,678.80, 28,541.28 and 13,605.88 is: 18,779.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,678.80 : 28,541.28 = 13,605.88 : x
  2. Step 2: Convert to fraction form
    20,678.80/28,541.28 = 13,605.88/x
  3. Step 3: Cross multiply
    20,678.80x = 28,541.28 × 13,605.88
  4. Step 4: Simplify right side
    20,678.80x = 388,329,230.73
  5. Step 5: Solve for x
    x = 388,329,230.73/20,678.80
  6. Step 6: Final answer
    x = 18,779.10

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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.