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Finding the Fourth Proportional to 916.82, 1,368.52 and 787.65

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Solution

The fourth proportional to 916.82, 1,368.52 and 787.65 is: 1,175.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.82 : 1,368.52 = 787.65 : x
  2. Step 2: Convert to fraction form
    916.82/1,368.52 = 787.65/x
  3. Step 3: Cross multiply
    916.82x = 1,368.52 × 787.65
  4. Step 4: Simplify right side
    916.82x = 1,077,913.74
  5. Step 5: Solve for x
    x = 1,077,913.74/916.82
  6. Step 6: Final answer
    x = 1,175.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.