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Finding the Fourth Proportional to 915.89, 1,374.39 and 526.38

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Solution

The fourth proportional to 915.89, 1,374.39 and 526.38 is: 789.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.89 : 1,374.39 = 526.38 : x
  2. Step 2: Convert to fraction form
    915.89/1,374.39 = 526.38/x
  3. Step 3: Cross multiply
    915.89x = 1,374.39 × 526.38
  4. Step 4: Simplify right side
    915.89x = 723,451.41
  5. Step 5: Solve for x
    x = 723,451.41/915.89
  6. Step 6: Final answer
    x = 789.89

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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.