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Finding the Fourth Proportional to 918.88, 1,370.12 and 880.48

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Solution

The fourth proportional to 918.88, 1,370.12 and 880.48 is: 1,312.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.88 : 1,370.12 = 880.48 : x
  2. Step 2: Convert to fraction form
    918.88/1,370.12 = 880.48/x
  3. Step 3: Cross multiply
    918.88x = 1,370.12 × 880.48
  4. Step 4: Simplify right side
    918.88x = 1,206,363.26
  5. Step 5: Solve for x
    x = 1,206,363.26/918.88
  6. Step 6: Final answer
    x = 1,312.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.