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Finding the Fourth Proportional to 690.44, 953.24 and 478.13

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Solution

The fourth proportional to 690.44, 953.24 and 478.13 is: 660.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.44 : 953.24 = 478.13 : x
  2. Step 2: Convert to fraction form
    690.44/953.24 = 478.13/x
  3. Step 3: Cross multiply
    690.44x = 953.24 × 478.13
  4. Step 4: Simplify right side
    690.44x = 455,765.48
  5. Step 5: Solve for x
    x = 455,765.48/690.44
  6. Step 6: Final answer
    x = 660.11

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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.