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Finding the Fourth Proportional to 1,225.76, 1,838.72 and 360

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Solution

The fourth proportional to 1,225.76, 1,838.72 and 360 is: 540.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.76 : 1,838.72 = 360 : x
  2. Step 2: Convert to fraction form
    1,225.76/1,838.72 = 360/x
  3. Step 3: Cross multiply
    1,225.76x = 1,838.72 × 360
  4. Step 4: Simplify right side
    1,225.76x = 661,939.20
  5. Step 5: Solve for x
    x = 661,939.20/1,225.76
  6. Step 6: Final answer
    x = 540.02

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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.