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Finding the Fourth Proportional to 916.94, 1,368.66 and 807.59

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Solution

The fourth proportional to 916.94, 1,368.66 and 807.59 is: 1,205.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.94 : 1,368.66 = 807.59 : x
  2. Step 2: Convert to fraction form
    916.94/1,368.66 = 807.59/x
  3. Step 3: Cross multiply
    916.94x = 1,368.66 × 807.59
  4. Step 4: Simplify right side
    916.94x = 1,105,309.29
  5. Step 5: Solve for x
    x = 1,105,309.29/916.94
  6. Step 6: Final answer
    x = 1,205.44

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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.