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Finding the Fourth Proportional to 18,995.74, 28,478.01 and 12,339.10

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Solution

The fourth proportional to 18,995.74, 28,478.01 and 12,339.10 is: 18,498.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,995.74 : 28,478.01 = 12,339.10 : x
  2. Step 2: Convert to fraction form
    18,995.74/28,478.01 = 12,339.10/x
  3. Step 3: Cross multiply
    18,995.74x = 28,478.01 × 12,339.10
  4. Step 4: Simplify right side
    18,995.74x = 351,393,013.19
  5. Step 5: Solve for x
    x = 351,393,013.19/18,995.74
  6. Step 6: Final answer
    x = 18,498.52

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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.