Home / 20,689.60-31,031.32-7,538.88

Finding the Fourth Proportional to 20,689.60, 31,031.32 and 7,538.88

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Solution

The fourth proportional to 20,689.60, 31,031.32 and 7,538.88 is: 11,307.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.60 : 31,031.32 = 7,538.88 : x
  2. Step 2: Convert to fraction form
    20,689.60/31,031.32 = 7,538.88/x
  3. Step 3: Cross multiply
    20,689.60x = 31,031.32 × 7,538.88
  4. Step 4: Simplify right side
    20,689.60x = 233,941,397.72
  5. Step 5: Solve for x
    x = 233,941,397.72/20,689.60
  6. Step 6: Final answer
    x = 11,307.20

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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.