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Finding the Fourth Proportional to 918.72, 1,267.86 and 624.12

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Solution

The fourth proportional to 918.72, 1,267.86 and 624.12 is: 861.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.72 : 1,267.86 = 624.12 : x
  2. Step 2: Convert to fraction form
    918.72/1,267.86 = 624.12/x
  3. Step 3: Cross multiply
    918.72x = 1,267.86 × 624.12
  4. Step 4: Simplify right side
    918.72x = 791,296.78
  5. Step 5: Solve for x
    x = 791,296.78/918.72
  6. Step 6: Final answer
    x = 861.30

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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.