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Finding the Fourth Proportional to 656.69, 985.91 and 519.89

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Solution

The fourth proportional to 656.69, 985.91 and 519.89 is: 780.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.69 : 985.91 = 519.89 : x
  2. Step 2: Convert to fraction form
    656.69/985.91 = 519.89/x
  3. Step 3: Cross multiply
    656.69x = 985.91 × 519.89
  4. Step 4: Simplify right side
    656.69x = 512,557.22
  5. Step 5: Solve for x
    x = 512,557.22/656.69
  6. Step 6: Final answer
    x = 780.52

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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.