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Finding the Fourth Proportional to 661.26, 913.40 and 551.30

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Solution

The fourth proportional to 661.26, 913.40 and 551.30 is: 761.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.26 : 913.40 = 551.30 : x
  2. Step 2: Convert to fraction form
    661.26/913.40 = 551.30/x
  3. Step 3: Cross multiply
    661.26x = 913.40 × 551.30
  4. Step 4: Simplify right side
    661.26x = 503,558.69
  5. Step 5: Solve for x
    x = 503,558.69/661.26
  6. Step 6: Final answer
    x = 761.52

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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.