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Finding the Fourth Proportional to 690.61, 1,030.85 and 608.60

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Solution

The fourth proportional to 690.61, 1,030.85 and 608.60 is: 908.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.61 : 1,030.85 = 608.60 : x
  2. Step 2: Convert to fraction form
    690.61/1,030.85 = 608.60/x
  3. Step 3: Cross multiply
    690.61x = 1,030.85 × 608.60
  4. Step 4: Simplify right side
    690.61x = 627,371.68
  5. Step 5: Solve for x
    x = 627,371.68/690.61
  6. Step 6: Final answer
    x = 908.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.