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Finding the Fourth Proportional to 1,215.04, 1,677 and 691.24

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Solution

The fourth proportional to 1,215.04, 1,677 and 691.24 is: 954.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.04 : 1,677 = 691.24 : x
  2. Step 2: Convert to fraction form
    1,215.04/1,677 = 691.24/x
  3. Step 3: Cross multiply
    1,215.04x = 1,677 × 691.24
  4. Step 4: Simplify right side
    1,215.04x = 1,159,209.48
  5. Step 5: Solve for x
    x = 1,159,209.48/1,215.04
  6. Step 6: Final answer
    x = 954.05

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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.