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Finding the Fourth Proportional to 918.88, 1,378.28 and 553.74

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Solution

The fourth proportional to 918.88, 1,378.28 and 553.74 is: 830.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.88 : 1,378.28 = 553.74 : x
  2. Step 2: Convert to fraction form
    918.88/1,378.28 = 553.74/x
  3. Step 3: Cross multiply
    918.88x = 1,378.28 × 553.74
  4. Step 4: Simplify right side
    918.88x = 763,208.77
  5. Step 5: Solve for x
    x = 763,208.77/918.88
  6. Step 6: Final answer
    x = 830.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.