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Finding the Fourth Proportional to 918.18, 1,267.92 and 623.34

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Solution

The fourth proportional to 918.18, 1,267.92 and 623.34 is: 860.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.18 : 1,267.92 = 623.34 : x
  2. Step 2: Convert to fraction form
    918.18/1,267.92 = 623.34/x
  3. Step 3: Cross multiply
    918.18x = 1,267.92 × 623.34
  4. Step 4: Simplify right side
    918.18x = 790,345.25
  5. Step 5: Solve for x
    x = 790,345.25/918.18
  6. Step 6: Final answer
    x = 860.77

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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.