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Finding the Fourth Proportional to 918.81, 1,267.11 and 619.92

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Solution

The fourth proportional to 918.81, 1,267.11 and 619.92 is: 854.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.81 : 1,267.11 = 619.92 : x
  2. Step 2: Convert to fraction form
    918.81/1,267.11 = 619.92/x
  3. Step 3: Cross multiply
    918.81x = 1,267.11 × 619.92
  4. Step 4: Simplify right side
    918.81x = 785,506.83
  5. Step 5: Solve for x
    x = 785,506.83/918.81
  6. Step 6: Final answer
    x = 854.92

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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.