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Finding the Fourth Proportional to 672.40, 928.02 and 628.48

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Solution

The fourth proportional to 672.40, 928.02 and 628.48 is: 867.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.40 : 928.02 = 628.48 : x
  2. Step 2: Convert to fraction form
    672.40/928.02 = 628.48/x
  3. Step 3: Cross multiply
    672.40x = 928.02 × 628.48
  4. Step 4: Simplify right side
    672.40x = 583,242.01
  5. Step 5: Solve for x
    x = 583,242.01/672.40
  6. Step 6: Final answer
    x = 867.40

Related Problems

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Double scale
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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.