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Finding the Fourth Proportional to 672.76, 928.41 and 393.16

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Solution

The fourth proportional to 672.76, 928.41 and 393.16 is: 542.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.76 : 928.41 = 393.16 : x
  2. Step 2: Convert to fraction form
    672.76/928.41 = 393.16/x
  3. Step 3: Cross multiply
    672.76x = 928.41 × 393.16
  4. Step 4: Simplify right side
    672.76x = 365,013.68
  5. Step 5: Solve for x
    x = 365,013.68/672.76
  6. Step 6: Final answer
    x = 542.56

Related Problems

Find fourth proportional to 336.38, 464.21 and 196.58
Half scale
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Double scale
Find fourth proportional to 673.76, 929.79 and 394.16
Similar ratio
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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.