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Finding the Fourth Proportional to 916.99, 1,266.48 and 621.74

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Solution

The fourth proportional to 916.99, 1,266.48 and 621.74 is: 858.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.99 : 1,266.48 = 621.74 : x
  2. Step 2: Convert to fraction form
    916.99/1,266.48 = 621.74/x
  3. Step 3: Cross multiply
    916.99x = 1,266.48 × 621.74
  4. Step 4: Simplify right side
    916.99x = 787,424.44
  5. Step 5: Solve for x
    x = 787,424.44/916.99
  6. Step 6: Final answer
    x = 858.71

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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.