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Finding the Fourth Proportional to 918.40, 1,378.28 and 572.24

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Solution

The fourth proportional to 918.40, 1,378.28 and 572.24 is: 858.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.40 : 1,378.28 = 572.24 : x
  2. Step 2: Convert to fraction form
    918.40/1,378.28 = 572.24/x
  3. Step 3: Cross multiply
    918.40x = 1,378.28 × 572.24
  4. Step 4: Simplify right side
    918.40x = 788,706.95
  5. Step 5: Solve for x
    x = 788,706.95/918.40
  6. Step 6: Final answer
    x = 858.78

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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.