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Finding the Fourth Proportional to 672.21, 928.40 and 663.10

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Solution

The fourth proportional to 672.21, 928.40 and 663.10 is: 915.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.21 : 928.40 = 663.10 : x
  2. Step 2: Convert to fraction form
    672.21/928.40 = 663.10/x
  3. Step 3: Cross multiply
    672.21x = 928.40 × 663.10
  4. Step 4: Simplify right side
    672.21x = 615,616.40
  5. Step 5: Solve for x
    x = 615,616.40/672.21
  6. Step 6: Final answer
    x = 915.81

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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.