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Finding the Fourth Proportional to 556.86, 768.36 and 320.76

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Solution

The fourth proportional to 556.86, 768.36 and 320.76 is: 442.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.86 : 768.36 = 320.76 : x
  2. Step 2: Convert to fraction form
    556.86/768.36 = 320.76/x
  3. Step 3: Cross multiply
    556.86x = 768.36 × 320.76
  4. Step 4: Simplify right side
    556.86x = 246,459.15
  5. Step 5: Solve for x
    x = 246,459.15/556.86
  6. Step 6: Final answer
    x = 442.59

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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.