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Finding the Fourth Proportional to 21,423.80, 32,135.70 and 21,205.10

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Solution

The fourth proportional to 21,423.80, 32,135.70 and 21,205.10 is: 31,807.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,423.80 : 32,135.70 = 21,205.10 : x
  2. Step 2: Convert to fraction form
    21,423.80/32,135.70 = 21,205.10/x
  3. Step 3: Cross multiply
    21,423.80x = 32,135.70 × 21,205.10
  4. Step 4: Simplify right side
    21,423.80x = 681,440,732.07
  5. Step 5: Solve for x
    x = 681,440,732.07/21,423.80
  6. Step 6: Final answer
    x = 31,807.65

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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.