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Finding the Fourth Proportional to 885.32, 1,221.76 and 512.30

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Solution

The fourth proportional to 885.32, 1,221.76 and 512.30 is: 706.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.32 : 1,221.76 = 512.30 : x
  2. Step 2: Convert to fraction form
    885.32/1,221.76 = 512.30/x
  3. Step 3: Cross multiply
    885.32x = 1,221.76 × 512.30
  4. Step 4: Simplify right side
    885.32x = 625,907.65
  5. Step 5: Solve for x
    x = 625,907.65/885.32
  6. Step 6: Final answer
    x = 706.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.