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Finding the Fourth Proportional to 916.33, 1,374.55 and 389.14

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Solution

The fourth proportional to 916.33, 1,374.55 and 389.14 is: 583.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.33 : 1,374.55 = 389.14 : x
  2. Step 2: Convert to fraction form
    916.33/1,374.55 = 389.14/x
  3. Step 3: Cross multiply
    916.33x = 1,374.55 × 389.14
  4. Step 4: Simplify right side
    916.33x = 534,892.39
  5. Step 5: Solve for x
    x = 534,892.39/916.33
  6. Step 6: Final answer
    x = 583.73

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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.