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Finding the Fourth Proportional to 626.60, 870.67 and 618.84

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Solution

The fourth proportional to 626.60, 870.67 and 618.84 is: 859.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.60 : 870.67 = 618.84 : x
  2. Step 2: Convert to fraction form
    626.60/870.67 = 618.84/x
  3. Step 3: Cross multiply
    626.60x = 870.67 × 618.84
  4. Step 4: Simplify right side
    626.60x = 538,805.42
  5. Step 5: Solve for x
    x = 538,805.42/626.60
  6. Step 6: Final answer
    x = 859.89

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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.