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Finding the Fourth Proportional to 560.69, 840.39 and 279.11

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Solution

The fourth proportional to 560.69, 840.39 and 279.11 is: 418.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    560.69 : 840.39 = 279.11 : x
  2. Step 2: Convert to fraction form
    560.69/840.39 = 279.11/x
  3. Step 3: Cross multiply
    560.69x = 840.39 × 279.11
  4. Step 4: Simplify right side
    560.69x = 234,562.31
  5. Step 5: Solve for x
    x = 234,562.31/560.69
  6. Step 6: Final answer
    x = 418.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.