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Finding the Fourth Proportional to 20,991.40, 28,959.90 and 12,034.12

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Solution

The fourth proportional to 20,991.40, 28,959.90 and 12,034.12 is: 16,602.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.40 : 28,959.90 = 12,034.12 : x
  2. Step 2: Convert to fraction form
    20,991.40/28,959.90 = 12,034.12/x
  3. Step 3: Cross multiply
    20,991.40x = 28,959.90 × 12,034.12
  4. Step 4: Simplify right side
    20,991.40x = 348,506,911.79
  5. Step 5: Solve for x
    x = 348,506,911.79/20,991.40
  6. Step 6: Final answer
    x = 16,602.37

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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.