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Finding the Fourth Proportional to 916.91, 1,374.53 and 339.38

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Solution

The fourth proportional to 916.91, 1,374.53 and 339.38 is: 508.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.91 : 1,374.53 = 339.38 : x
  2. Step 2: Convert to fraction form
    916.91/1,374.53 = 339.38/x
  3. Step 3: Cross multiply
    916.91x = 1,374.53 × 339.38
  4. Step 4: Simplify right side
    916.91x = 466,479.42
  5. Step 5: Solve for x
    x = 466,479.42/916.91
  6. Step 6: Final answer
    x = 508.75

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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.