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Finding the Fourth Proportional to 626.74, 870.79 and 619

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Solution

The fourth proportional to 626.74, 870.79 and 619 is: 860.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.74 : 870.79 = 619 : x
  2. Step 2: Convert to fraction form
    626.74/870.79 = 619/x
  3. Step 3: Cross multiply
    626.74x = 870.79 × 619
  4. Step 4: Simplify right side
    626.74x = 539,019.01
  5. Step 5: Solve for x
    x = 539,019.01/626.74
  6. Step 6: Final answer
    x = 860.04

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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.