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Finding the Fourth Proportional to 827.40, 1,240.74 and 358.88

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Solution

The fourth proportional to 827.40, 1,240.74 and 358.88 is: 538.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.40 : 1,240.74 = 358.88 : x
  2. Step 2: Convert to fraction form
    827.40/1,240.74 = 358.88/x
  3. Step 3: Cross multiply
    827.40x = 1,240.74 × 358.88
  4. Step 4: Simplify right side
    827.40x = 445,276.77
  5. Step 5: Solve for x
    x = 445,276.77/827.40
  6. Step 6: Final answer
    x = 538.16

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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.