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Finding the Fourth Proportional to 918.90, 1,267.58 and 564.69

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Solution

The fourth proportional to 918.90, 1,267.58 and 564.69 is: 778.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.90 : 1,267.58 = 564.69 : x
  2. Step 2: Convert to fraction form
    918.90/1,267.58 = 564.69/x
  3. Step 3: Cross multiply
    918.90x = 1,267.58 × 564.69
  4. Step 4: Simplify right side
    918.90x = 715,788.48
  5. Step 5: Solve for x
    x = 715,788.48/918.90
  6. Step 6: Final answer
    x = 778.97

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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.