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Finding the Fourth Proportional to 672.74, 928.47 and 378.03

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Solution

The fourth proportional to 672.74, 928.47 and 378.03 is: 521.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.74 : 928.47 = 378.03 : x
  2. Step 2: Convert to fraction form
    672.74/928.47 = 378.03/x
  3. Step 3: Cross multiply
    672.74x = 928.47 × 378.03
  4. Step 4: Simplify right side
    672.74x = 350,989.51
  5. Step 5: Solve for x
    x = 350,989.51/672.74
  6. Step 6: Final answer
    x = 521.74

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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.