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Finding the Fourth Proportional to 663.30, 915.39 and 383.63

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Solution

The fourth proportional to 663.30, 915.39 and 383.63 is: 529.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.30 : 915.39 = 383.63 : x
  2. Step 2: Convert to fraction form
    663.30/915.39 = 383.63/x
  3. Step 3: Cross multiply
    663.30x = 915.39 × 383.63
  4. Step 4: Simplify right side
    663.30x = 351,166.49
  5. Step 5: Solve for x
    x = 351,166.49/663.30
  6. Step 6: Final answer
    x = 529.42

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1.5x scale

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.