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Finding the Fourth Proportional to 672.76, 928.48 and 378.08

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Solution

The fourth proportional to 672.76, 928.48 and 378.08 is: 521.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.76 : 928.48 = 378.08 : x
  2. Step 2: Convert to fraction form
    672.76/928.48 = 378.08/x
  3. Step 3: Cross multiply
    672.76x = 928.48 × 378.08
  4. Step 4: Simplify right side
    672.76x = 351,039.72
  5. Step 5: Solve for x
    x = 351,039.72/672.76
  6. Step 6: Final answer
    x = 521.79

Related Problems

Find fourth proportional to 336.38, 464.24 and 189.04
Half scale
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Double scale
Find fourth proportional to 673.76, 929.86 and 379.08
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.