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Finding the Fourth Proportional to 517.77, 777.42 and 345.51

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Solution

The fourth proportional to 517.77, 777.42 and 345.51 is: 518.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.77 : 777.42 = 345.51 : x
  2. Step 2: Convert to fraction form
    517.77/777.42 = 345.51/x
  3. Step 3: Cross multiply
    517.77x = 777.42 × 345.51
  4. Step 4: Simplify right side
    517.77x = 268,606.38
  5. Step 5: Solve for x
    x = 268,606.38/517.77
  6. Step 6: Final answer
    x = 518.78

Related Problems

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.