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Finding the Fourth Proportional to 690.63, 952.55 and 488.66

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Solution

The fourth proportional to 690.63, 952.55 and 488.66 is: 673.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.63 : 952.55 = 488.66 : x
  2. Step 2: Convert to fraction form
    690.63/952.55 = 488.66/x
  3. Step 3: Cross multiply
    690.63x = 952.55 × 488.66
  4. Step 4: Simplify right side
    690.63x = 465,471.92
  5. Step 5: Solve for x
    x = 465,471.92/690.63
  6. Step 6: Final answer
    x = 673.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.