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Finding the Fourth Proportional to 704.48, 1,055.48 and 338.78

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Solution

The fourth proportional to 704.48, 1,055.48 and 338.78 is: 507.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.48 : 1,055.48 = 338.78 : x
  2. Step 2: Convert to fraction form
    704.48/1,055.48 = 338.78/x
  3. Step 3: Cross multiply
    704.48x = 1,055.48 × 338.78
  4. Step 4: Simplify right side
    704.48x = 357,575.51
  5. Step 5: Solve for x
    x = 357,575.51/704.48
  6. Step 6: Final answer
    x = 507.57

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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.