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Finding the Fourth Proportional to 1,072.16, 1,479.38 and 646.80

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Solution

The fourth proportional to 1,072.16, 1,479.38 and 646.80 is: 892.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.16 : 1,479.38 = 646.80 : x
  2. Step 2: Convert to fraction form
    1,072.16/1,479.38 = 646.80/x
  3. Step 3: Cross multiply
    1,072.16x = 1,479.38 × 646.80
  4. Step 4: Simplify right side
    1,072.16x = 956,862.98
  5. Step 5: Solve for x
    x = 956,862.98/1,072.16
  6. Step 6: Final answer
    x = 892.46

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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.