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Finding the Fourth Proportional to 690.63, 954.87 and 660.03

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Solution

The fourth proportional to 690.63, 954.87 and 660.03 is: 912.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.63 : 954.87 = 660.03 : x
  2. Step 2: Convert to fraction form
    690.63/954.87 = 660.03/x
  3. Step 3: Cross multiply
    690.63x = 954.87 × 660.03
  4. Step 4: Simplify right side
    690.63x = 630,242.85
  5. Step 5: Solve for x
    x = 630,242.85/690.63
  6. Step 6: Final answer
    x = 912.56

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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.