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Finding the Fourth Proportional to 1,492.78, 2,239.01 and 382.20

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Solution

The fourth proportional to 1,492.78, 2,239.01 and 382.20 is: 573.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,492.78 : 2,239.01 = 382.20 : x
  2. Step 2: Convert to fraction form
    1,492.78/2,239.01 = 382.20/x
  3. Step 3: Cross multiply
    1,492.78x = 2,239.01 × 382.20
  4. Step 4: Simplify right side
    1,492.78x = 855,747.71
  5. Step 5: Solve for x
    x = 855,747.71/1,492.78
  6. Step 6: Final answer
    x = 573.26

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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.