Home / 20,868.55-28,781.84-18,345.31

Finding the Fourth Proportional to 20,868.55, 28,781.84 and 18,345.31

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Solution

The fourth proportional to 20,868.55, 28,781.84 and 18,345.31 is: 25,301.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.55 : 28,781.84 = 18,345.31 : x
  2. Step 2: Convert to fraction form
    20,868.55/28,781.84 = 18,345.31/x
  3. Step 3: Cross multiply
    20,868.55x = 28,781.84 × 18,345.31
  4. Step 4: Simplify right side
    20,868.55x = 528,011,751.08
  5. Step 5: Solve for x
    x = 528,011,751.08/20,868.55
  6. Step 6: Final answer
    x = 25,301.80

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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.