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Finding the Fourth Proportional to 560.64, 839.43 and 438.78

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Solution

The fourth proportional to 560.64, 839.43 and 438.78 is: 656.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    560.64 : 839.43 = 438.78 : x
  2. Step 2: Convert to fraction form
    560.64/839.43 = 438.78/x
  3. Step 3: Cross multiply
    560.64x = 839.43 × 438.78
  4. Step 4: Simplify right side
    560.64x = 368,325.10
  5. Step 5: Solve for x
    x = 368,325.10/560.64
  6. Step 6: Final answer
    x = 656.97

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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.