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Finding the Fourth Proportional to 890.15, 1,333.97 and 840.87

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Solution

The fourth proportional to 890.15, 1,333.97 and 840.87 is: 1,260.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.15 : 1,333.97 = 840.87 : x
  2. Step 2: Convert to fraction form
    890.15/1,333.97 = 840.87/x
  3. Step 3: Cross multiply
    890.15x = 1,333.97 × 840.87
  4. Step 4: Simplify right side
    890.15x = 1,121,695.35
  5. Step 5: Solve for x
    x = 1,121,695.35/890.15
  6. Step 6: Final answer
    x = 1,260.12

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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.