Home / 21,013.60-31,478.80-13,623.20

Finding the Fourth Proportional to 21,013.60, 31,478.80 and 13,623.20

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Solution

The fourth proportional to 21,013.60, 31,478.80 and 13,623.20 is: 20,407.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,013.60 : 31,478.80 = 13,623.20 : x
  2. Step 2: Convert to fraction form
    21,013.60/31,478.80 = 13,623.20/x
  3. Step 3: Cross multiply
    21,013.60x = 31,478.80 × 13,623.20
  4. Step 4: Simplify right side
    21,013.60x = 428,841,988.16
  5. Step 5: Solve for x
    x = 428,841,988.16/21,013.60
  6. Step 6: Final answer
    x = 20,407.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.