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Finding the Fourth Proportional to 890.83, 1,335.72 and 790.90

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Solution

The fourth proportional to 890.83, 1,335.72 and 790.90 is: 1,185.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.83 : 1,335.72 = 790.90 : x
  2. Step 2: Convert to fraction form
    890.83/1,335.72 = 790.90/x
  3. Step 3: Cross multiply
    890.83x = 1,335.72 × 790.90
  4. Step 4: Simplify right side
    890.83x = 1,056,420.57
  5. Step 5: Solve for x
    x = 1,056,420.57/890.83
  6. Step 6: Final answer
    x = 1,185.88

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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.