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Finding the Fourth Proportional to 1,207.76, 1,811.88 and 688

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Solution

The fourth proportional to 1,207.76, 1,811.88 and 688 is: 1,032.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.76 : 1,811.88 = 688 : x
  2. Step 2: Convert to fraction form
    1,207.76/1,811.88 = 688/x
  3. Step 3: Cross multiply
    1,207.76x = 1,811.88 × 688
  4. Step 4: Simplify right side
    1,207.76x = 1,246,573.44
  5. Step 5: Solve for x
    x = 1,246,573.44/1,207.76
  6. Step 6: Final answer
    x = 1,032.14

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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.