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Finding the Fourth Proportional to 1,225.39, 1,838.18 and 347.90

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Solution

The fourth proportional to 1,225.39, 1,838.18 and 347.90 is: 521.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.39 : 1,838.18 = 347.90 : x
  2. Step 2: Convert to fraction form
    1,225.39/1,838.18 = 347.90/x
  3. Step 3: Cross multiply
    1,225.39x = 1,838.18 × 347.90
  4. Step 4: Simplify right side
    1,225.39x = 639,494.50
  5. Step 5: Solve for x
    x = 639,494.50/1,225.39
  6. Step 6: Final answer
    x = 521.87

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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.