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Finding the Fourth Proportional to 629.70, 939.50 and 560.40

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Solution

The fourth proportional to 629.70, 939.50 and 560.40 is: 836.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.70 : 939.50 = 560.40 : x
  2. Step 2: Convert to fraction form
    629.70/939.50 = 560.40/x
  3. Step 3: Cross multiply
    629.70x = 939.50 × 560.40
  4. Step 4: Simplify right side
    629.70x = 526,493.00
  5. Step 5: Solve for x
    x = 526,493.00/629.70
  6. Step 6: Final answer
    x = 836.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.