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Finding the Fourth Proportional to 851.38, 1,174.57 and 630.79

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Solution

The fourth proportional to 851.38, 1,174.57 and 630.79 is: 870.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.38 : 1,174.57 = 630.79 : x
  2. Step 2: Convert to fraction form
    851.38/1,174.57 = 630.79/x
  3. Step 3: Cross multiply
    851.38x = 1,174.57 × 630.79
  4. Step 4: Simplify right side
    851.38x = 740,907.01
  5. Step 5: Solve for x
    x = 740,907.01/851.38
  6. Step 6: Final answer
    x = 870.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.