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Finding the Fourth Proportional to 672.76, 928.42 and 393.17

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Solution

The fourth proportional to 672.76, 928.42 and 393.17 is: 542.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.76 : 928.42 = 393.17 : x
  2. Step 2: Convert to fraction form
    672.76/928.42 = 393.17/x
  3. Step 3: Cross multiply
    672.76x = 928.42 × 393.17
  4. Step 4: Simplify right side
    672.76x = 365,027.59
  5. Step 5: Solve for x
    x = 365,027.59/672.76
  6. Step 6: Final answer
    x = 542.58

Related Problems

Find fourth proportional to 336.38, 464.21 and 196.59
Half scale
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Double scale
Find fourth proportional to 673.76, 929.80 and 394.17
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.