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Finding the Fourth Proportional to 708.69, 978.30 and 551.75

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Solution

The fourth proportional to 708.69, 978.30 and 551.75 is: 761.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.69 : 978.30 = 551.75 : x
  2. Step 2: Convert to fraction form
    708.69/978.30 = 551.75/x
  3. Step 3: Cross multiply
    708.69x = 978.30 × 551.75
  4. Step 4: Simplify right side
    708.69x = 539,779.47
  5. Step 5: Solve for x
    x = 539,779.47/708.69
  6. Step 6: Final answer
    x = 761.66

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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.