Home / 20,971.20-28,934.40-13,013.76

Finding the Fourth Proportional to 20,971.20, 28,934.40 and 13,013.76

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Solution

The fourth proportional to 20,971.20, 28,934.40 and 13,013.76 is: 17,955.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.20 : 28,934.40 = 13,013.76 : x
  2. Step 2: Convert to fraction form
    20,971.20/28,934.40 = 13,013.76/x
  3. Step 3: Cross multiply
    20,971.20x = 28,934.40 × 13,013.76
  4. Step 4: Simplify right side
    20,971.20x = 376,545,337.34
  5. Step 5: Solve for x
    x = 376,545,337.34/20,971.20
  6. Step 6: Final answer
    x = 17,955.35

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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.