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Finding the Fourth Proportional to 688.52, 1,037.80 and 618.08

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Solution

The fourth proportional to 688.52, 1,037.80 and 618.08 is: 931.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.52 : 1,037.80 = 618.08 : x
  2. Step 2: Convert to fraction form
    688.52/1,037.80 = 618.08/x
  3. Step 3: Cross multiply
    688.52x = 1,037.80 × 618.08
  4. Step 4: Simplify right side
    688.52x = 641,440.33
  5. Step 5: Solve for x
    x = 641,440.33/688.52
  6. Step 6: Final answer
    x = 931.62

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.