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Finding the Fourth Proportional to 560.21, 773.06 and 311.53

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Solution

The fourth proportional to 560.21, 773.06 and 311.53 is: 429.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    560.21 : 773.06 = 311.53 : x
  2. Step 2: Convert to fraction form
    560.21/773.06 = 311.53/x
  3. Step 3: Cross multiply
    560.21x = 773.06 × 311.53
  4. Step 4: Simplify right side
    560.21x = 240,830.23
  5. Step 5: Solve for x
    x = 240,830.23/560.21
  6. Step 6: Final answer
    x = 429.90

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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.