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Finding the Fourth Proportional to 888.65, 1,325.20 and 840.13

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Solution

The fourth proportional to 888.65, 1,325.20 and 840.13 is: 1,252.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.65 : 1,325.20 = 840.13 : x
  2. Step 2: Convert to fraction form
    888.65/1,325.20 = 840.13/x
  3. Step 3: Cross multiply
    888.65x = 1,325.20 × 840.13
  4. Step 4: Simplify right side
    888.65x = 1,113,333.65
  5. Step 5: Solve for x
    x = 1,113,333.65/888.65
  6. Step 6: Final answer
    x = 1,252.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.