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Finding the Fourth Proportional to 560.40, 839.70 and 405.96

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Solution

The fourth proportional to 560.40, 839.70 and 405.96 is: 608.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    560.40 : 839.70 = 405.96 : x
  2. Step 2: Convert to fraction form
    560.40/839.70 = 405.96/x
  3. Step 3: Cross multiply
    560.40x = 839.70 × 405.96
  4. Step 4: Simplify right side
    560.40x = 340,884.61
  5. Step 5: Solve for x
    x = 340,884.61/560.40
  6. Step 6: Final answer
    x = 608.29

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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.