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Finding the Fourth Proportional to 1,305.78, 1,957.20 and 688.16

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Solution

The fourth proportional to 1,305.78, 1,957.20 and 688.16 is: 1,031.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.78 : 1,957.20 = 688.16 : x
  2. Step 2: Convert to fraction form
    1,305.78/1,957.20 = 688.16/x
  3. Step 3: Cross multiply
    1,305.78x = 1,957.20 × 688.16
  4. Step 4: Simplify right side
    1,305.78x = 1,346,866.75
  5. Step 5: Solve for x
    x = 1,346,866.75/1,305.78
  6. Step 6: Final answer
    x = 1,031.47

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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.