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Finding the Fourth Proportional to 672.85, 928.90 and 407.34

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Solution

The fourth proportional to 672.85, 928.90 and 407.34 is: 562.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.85 : 928.90 = 407.34 : x
  2. Step 2: Convert to fraction form
    672.85/928.90 = 407.34/x
  3. Step 3: Cross multiply
    672.85x = 928.90 × 407.34
  4. Step 4: Simplify right side
    672.85x = 378,378.13
  5. Step 5: Solve for x
    x = 378,378.13/672.85
  6. Step 6: Final answer
    x = 562.35

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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.