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Finding the Fourth Proportional to 672.24, 927.36 and 420.12

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Solution

The fourth proportional to 672.24, 927.36 and 420.12 is: 579.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.24 : 927.36 = 420.12 : x
  2. Step 2: Convert to fraction form
    672.24/927.36 = 420.12/x
  3. Step 3: Cross multiply
    672.24x = 927.36 × 420.12
  4. Step 4: Simplify right side
    672.24x = 389,602.48
  5. Step 5: Solve for x
    x = 389,602.48/672.24
  6. Step 6: Final answer
    x = 579.56

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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.