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Finding the Fourth Proportional to 690.96, 953.52 and 421.76

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Solution

The fourth proportional to 690.96, 953.52 and 421.76 is: 582.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.96 : 953.52 = 421.76 : x
  2. Step 2: Convert to fraction form
    690.96/953.52 = 421.76/x
  3. Step 3: Cross multiply
    690.96x = 953.52 × 421.76
  4. Step 4: Simplify right side
    690.96x = 402,156.60
  5. Step 5: Solve for x
    x = 402,156.60/690.96
  6. Step 6: Final answer
    x = 582.03

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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.