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Finding the Fourth Proportional to 672.40, 928.36 and 451.64

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Solution

The fourth proportional to 672.40, 928.36 and 451.64 is: 623.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.40 : 928.36 = 451.64 : x
  2. Step 2: Convert to fraction form
    672.40/928.36 = 451.64/x
  3. Step 3: Cross multiply
    672.40x = 928.36 × 451.64
  4. Step 4: Simplify right side
    672.40x = 419,284.51
  5. Step 5: Solve for x
    x = 419,284.51/672.40
  6. Step 6: Final answer
    x = 623.56

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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.