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Finding the Fourth Proportional to 840.45, 1,158.91 and 663.56

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Solution

The fourth proportional to 840.45, 1,158.91 and 663.56 is: 914.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.45 : 1,158.91 = 663.56 : x
  2. Step 2: Convert to fraction form
    840.45/1,158.91 = 663.56/x
  3. Step 3: Cross multiply
    840.45x = 1,158.91 × 663.56
  4. Step 4: Simplify right side
    840.45x = 769,006.32
  5. Step 5: Solve for x
    x = 769,006.32/840.45
  6. Step 6: Final answer
    x = 914.99

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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.