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Finding the Fourth Proportional to 646.11, 891.88 and 397.77

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Solution

The fourth proportional to 646.11, 891.88 and 397.77 is: 549.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.11 : 891.88 = 397.77 : x
  2. Step 2: Convert to fraction form
    646.11/891.88 = 397.77/x
  3. Step 3: Cross multiply
    646.11x = 891.88 × 397.77
  4. Step 4: Simplify right side
    646.11x = 354,763.11
  5. Step 5: Solve for x
    x = 354,763.11/646.11
  6. Step 6: Final answer
    x = 549.08

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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.