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Finding the Fourth Proportional to 918.70, 1,266.78 and 624.13

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Solution

The fourth proportional to 918.70, 1,266.78 and 624.13 is: 860.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.70 : 1,266.78 = 624.13 : x
  2. Step 2: Convert to fraction form
    918.70/1,266.78 = 624.13/x
  3. Step 3: Cross multiply
    918.70x = 1,266.78 × 624.13
  4. Step 4: Simplify right side
    918.70x = 790,635.40
  5. Step 5: Solve for x
    x = 790,635.40/918.70
  6. Step 6: Final answer
    x = 860.60

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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.