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Finding the Fourth Proportional to 840.58, 1,158.50 and 816.89

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Solution

The fourth proportional to 840.58, 1,158.50 and 816.89 is: 1,125.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.58 : 1,158.50 = 816.89 : x
  2. Step 2: Convert to fraction form
    840.58/1,158.50 = 816.89/x
  3. Step 3: Cross multiply
    840.58x = 1,158.50 × 816.89
  4. Step 4: Simplify right side
    840.58x = 946,363.31
  5. Step 5: Solve for x
    x = 946,363.31/840.58
  6. Step 6: Final answer
    x = 1,125.85

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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.