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Finding the Fourth Proportional to 656.58, 985.80 and 576.39

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Solution

The fourth proportional to 656.58, 985.80 and 576.39 is: 865.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.58 : 985.80 = 576.39 : x
  2. Step 2: Convert to fraction form
    656.58/985.80 = 576.39/x
  3. Step 3: Cross multiply
    656.58x = 985.80 × 576.39
  4. Step 4: Simplify right side
    656.58x = 568,205.26
  5. Step 5: Solve for x
    x = 568,205.26/656.58
  6. Step 6: Final answer
    x = 865.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.