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Finding the Fourth Proportional to 663.75, 916.56 and 581.85

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Solution

The fourth proportional to 663.75, 916.56 and 581.85 is: 803.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.75 : 916.56 = 581.85 : x
  2. Step 2: Convert to fraction form
    663.75/916.56 = 581.85/x
  3. Step 3: Cross multiply
    663.75x = 916.56 × 581.85
  4. Step 4: Simplify right side
    663.75x = 533,300.44
  5. Step 5: Solve for x
    x = 533,300.44/663.75
  6. Step 6: Final answer
    x = 803.47

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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.