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Finding the Fourth Proportional to 916.38, 1,264.10 and 621.80

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Solution

The fourth proportional to 916.38, 1,264.10 and 621.80 is: 857.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.38 : 1,264.10 = 621.80 : x
  2. Step 2: Convert to fraction form
    916.38/1,264.10 = 621.80/x
  3. Step 3: Cross multiply
    916.38x = 1,264.10 × 621.80
  4. Step 4: Simplify right side
    916.38x = 786,017.38
  5. Step 5: Solve for x
    x = 786,017.38/916.38
  6. Step 6: Final answer
    x = 857.74

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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.