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Finding the Fourth Proportional to 918.62, 1,378.83 and 572.12

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Solution

The fourth proportional to 918.62, 1,378.83 and 572.12 is: 858.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.62 : 1,378.83 = 572.12 : x
  2. Step 2: Convert to fraction form
    918.62/1,378.83 = 572.12/x
  3. Step 3: Cross multiply
    918.62x = 1,378.83 × 572.12
  4. Step 4: Simplify right side
    918.62x = 788,856.22
  5. Step 5: Solve for x
    x = 788,856.22/918.62
  6. Step 6: Final answer
    x = 858.74

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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.