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Finding the Fourth Proportional to 916.38, 1,265.55 and 784.62

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Solution

The fourth proportional to 916.38, 1,265.55 and 784.62 is: 1,083.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.38 : 1,265.55 = 784.62 : x
  2. Step 2: Convert to fraction form
    916.38/1,265.55 = 784.62/x
  3. Step 3: Cross multiply
    916.38x = 1,265.55 × 784.62
  4. Step 4: Simplify right side
    916.38x = 992,975.84
  5. Step 5: Solve for x
    x = 992,975.84/916.38
  6. Step 6: Final answer
    x = 1,083.59

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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.