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Finding the Fourth Proportional to 864.96, 1,297.35 and 378.42

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Solution

The fourth proportional to 864.96, 1,297.35 and 378.42 is: 567.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.96 : 1,297.35 = 378.42 : x
  2. Step 2: Convert to fraction form
    864.96/1,297.35 = 378.42/x
  3. Step 3: Cross multiply
    864.96x = 1,297.35 × 378.42
  4. Step 4: Simplify right side
    864.96x = 490,943.19
  5. Step 5: Solve for x
    x = 490,943.19/864.96
  6. Step 6: Final answer
    x = 567.59

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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.