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Finding the Fourth Proportional to 626.12, 870.15 and 619.64

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Solution

The fourth proportional to 626.12, 870.15 and 619.64 is: 861.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.12 : 870.15 = 619.64 : x
  2. Step 2: Convert to fraction form
    626.12/870.15 = 619.64/x
  3. Step 3: Cross multiply
    626.12x = 870.15 × 619.64
  4. Step 4: Simplify right side
    626.12x = 539,179.75
  5. Step 5: Solve for x
    x = 539,179.75/626.12
  6. Step 6: Final answer
    x = 861.14

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.