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Finding the Fourth Proportional to 560.60, 839.10 and 438.20

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Solution

The fourth proportional to 560.60, 839.10 and 438.20 is: 655.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    560.60 : 839.10 = 438.20 : x
  2. Step 2: Convert to fraction form
    560.60/839.10 = 438.20/x
  3. Step 3: Cross multiply
    560.60x = 839.10 × 438.20
  4. Step 4: Simplify right side
    560.60x = 367,693.62
  5. Step 5: Solve for x
    x = 367,693.62/560.60
  6. Step 6: Final answer
    x = 655.89

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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.