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Finding the Fourth Proportional to 663.89, 915.89 and 427.77

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Solution

The fourth proportional to 663.89, 915.89 and 427.77 is: 590.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.89 : 915.89 = 427.77 : x
  2. Step 2: Convert to fraction form
    663.89/915.89 = 427.77/x
  3. Step 3: Cross multiply
    663.89x = 915.89 × 427.77
  4. Step 4: Simplify right side
    663.89x = 391,788.13
  5. Step 5: Solve for x
    x = 391,788.13/663.89
  6. Step 6: Final answer
    x = 590.14

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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.