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Finding the Fourth Proportional to 894.45, 1,230.62 and 870.15

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Solution

The fourth proportional to 894.45, 1,230.62 and 870.15 is: 1,197.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    894.45 : 1,230.62 = 870.15 : x
  2. Step 2: Convert to fraction form
    894.45/1,230.62 = 870.15/x
  3. Step 3: Cross multiply
    894.45x = 1,230.62 × 870.15
  4. Step 4: Simplify right side
    894.45x = 1,070,819.64
  5. Step 5: Solve for x
    x = 1,070,819.64/894.45
  6. Step 6: Final answer
    x = 1,197.18

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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.