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Finding the Fourth Proportional to 1,215.42, 1,677.30 and 691.50

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Solution

The fourth proportional to 1,215.42, 1,677.30 and 691.50 is: 954.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.42 : 1,677.30 = 691.50 : x
  2. Step 2: Convert to fraction form
    1,215.42/1,677.30 = 691.50/x
  3. Step 3: Cross multiply
    1,215.42x = 1,677.30 × 691.50
  4. Step 4: Simplify right side
    1,215.42x = 1,159,852.95
  5. Step 5: Solve for x
    x = 1,159,852.95/1,215.42
  6. Step 6: Final answer
    x = 954.28

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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.