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Finding the Fourth Proportional to 916.78, 1,262.60 and 792.40

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Solution

The fourth proportional to 916.78, 1,262.60 and 792.40 is: 1,091.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.78 : 1,262.60 = 792.40 : x
  2. Step 2: Convert to fraction form
    916.78/1,262.60 = 792.40/x
  3. Step 3: Cross multiply
    916.78x = 1,262.60 × 792.40
  4. Step 4: Simplify right side
    916.78x = 1,000,484.24
  5. Step 5: Solve for x
    x = 1,000,484.24/916.78
  6. Step 6: Final answer
    x = 1,091.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.