Home / 28,117.31-38,748.51-20,145.69

Finding the Fourth Proportional to 28,117.31, 38,748.51 and 20,145.69

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Solution

The fourth proportional to 28,117.31, 38,748.51 and 20,145.69 is: 27,762.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,117.31 : 38,748.51 = 20,145.69 : x
  2. Step 2: Convert to fraction form
    28,117.31/38,748.51 = 20,145.69/x
  3. Step 3: Cross multiply
    28,117.31x = 38,748.51 × 20,145.69
  4. Step 4: Simplify right side
    28,117.31x = 780,615,470.42
  5. Step 5: Solve for x
    x = 780,615,470.42/28,117.31
  6. Step 6: Final answer
    x = 27,762.81

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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.