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Finding the Fourth Proportional to 918.88, 1,267.92 and 608.80

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Solution

The fourth proportional to 918.88, 1,267.92 and 608.80 is: 840.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.88 : 1,267.92 = 608.80 : x
  2. Step 2: Convert to fraction form
    918.88/1,267.92 = 608.80/x
  3. Step 3: Cross multiply
    918.88x = 1,267.92 × 608.80
  4. Step 4: Simplify right side
    918.88x = 771,909.70
  5. Step 5: Solve for x
    x = 771,909.70/918.88
  6. Step 6: Final answer
    x = 840.05

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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.