Home / 20,780.47-28,687.40-12,827.08

Finding the Fourth Proportional to 20,780.47, 28,687.40 and 12,827.08

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Solution

The fourth proportional to 20,780.47, 28,687.40 and 12,827.08 is: 17,707.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.47 : 28,687.40 = 12,827.08 : x
  2. Step 2: Convert to fraction form
    20,780.47/28,687.40 = 12,827.08/x
  3. Step 3: Cross multiply
    20,780.47x = 28,687.40 × 12,827.08
  4. Step 4: Simplify right side
    20,780.47x = 367,975,574.79
  5. Step 5: Solve for x
    x = 367,975,574.79/20,780.47
  6. Step 6: Final answer
    x = 17,707.76

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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.