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Finding the Fourth Proportional to 905.42, 1,356.50 and 384.48

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Solution

The fourth proportional to 905.42, 1,356.50 and 384.48 is: 576.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.42 : 1,356.50 = 384.48 : x
  2. Step 2: Convert to fraction form
    905.42/1,356.50 = 384.48/x
  3. Step 3: Cross multiply
    905.42x = 1,356.50 × 384.48
  4. Step 4: Simplify right side
    905.42x = 521,547.12
  5. Step 5: Solve for x
    x = 521,547.12/905.42
  6. Step 6: Final answer
    x = 576.03

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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.