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Finding the Fourth Proportional to 690.63, 1,040.65 and 616.04

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Solution

The fourth proportional to 690.63, 1,040.65 and 616.04 is: 928.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.63 : 1,040.65 = 616.04 : x
  2. Step 2: Convert to fraction form
    690.63/1,040.65 = 616.04/x
  3. Step 3: Cross multiply
    690.63x = 1,040.65 × 616.04
  4. Step 4: Simplify right side
    690.63x = 641,082.03
  5. Step 5: Solve for x
    x = 641,082.03/690.63
  6. Step 6: Final answer
    x = 928.26

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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.