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Finding the Fourth Proportional to 1,115.27, 1,672.83 and 345.77

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Solution

The fourth proportional to 1,115.27, 1,672.83 and 345.77 is: 518.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.27 : 1,672.83 = 345.77 : x
  2. Step 2: Convert to fraction form
    1,115.27/1,672.83 = 345.77/x
  3. Step 3: Cross multiply
    1,115.27x = 1,672.83 × 345.77
  4. Step 4: Simplify right side
    1,115.27x = 578,406.06
  5. Step 5: Solve for x
    x = 578,406.06/1,115.27
  6. Step 6: Final answer
    x = 518.63

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Double scale
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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.