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Finding the Fourth Proportional to 20,980.88, 28,955.24 and 12,031.28

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Solution

The fourth proportional to 20,980.88, 28,955.24 and 12,031.28 is: 16,604.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,980.88 : 28,955.24 = 12,031.28 : x
  2. Step 2: Convert to fraction form
    20,980.88/28,955.24 = 12,031.28/x
  3. Step 3: Cross multiply
    20,980.88x = 28,955.24 × 12,031.28
  4. Step 4: Simplify right side
    20,980.88x = 348,368,599.91
  5. Step 5: Solve for x
    x = 348,368,599.91/20,980.88
  6. Step 6: Final answer
    x = 16,604.10

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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.