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Finding the Fourth Proportional to 1,139.18, 1,708.39 and 369.50

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Solution

The fourth proportional to 1,139.18, 1,708.39 and 369.50 is: 554.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.18 : 1,708.39 = 369.50 : x
  2. Step 2: Convert to fraction form
    1,139.18/1,708.39 = 369.50/x
  3. Step 3: Cross multiply
    1,139.18x = 1,708.39 × 369.50
  4. Step 4: Simplify right side
    1,139.18x = 631,250.11
  5. Step 5: Solve for x
    x = 631,250.11/1,139.18
  6. Step 6: Final answer
    x = 554.13

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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.