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Finding the Fourth Proportional to 560.08, 772.89 and 311.39

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Solution

The fourth proportional to 560.08, 772.89 and 311.39 is: 429.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    560.08 : 772.89 = 311.39 : x
  2. Step 2: Convert to fraction form
    560.08/772.89 = 311.39/x
  3. Step 3: Cross multiply
    560.08x = 772.89 × 311.39
  4. Step 4: Simplify right side
    560.08x = 240,666.35
  5. Step 5: Solve for x
    x = 240,666.35/560.08
  6. Step 6: Final answer
    x = 429.70

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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.