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Finding the Fourth Proportional to 720.43, 995.11 and 551.35

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Solution

The fourth proportional to 720.43, 995.11 and 551.35 is: 761.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.43 : 995.11 = 551.35 : x
  2. Step 2: Convert to fraction form
    720.43/995.11 = 551.35/x
  3. Step 3: Cross multiply
    720.43x = 995.11 × 551.35
  4. Step 4: Simplify right side
    720.43x = 548,648.65
  5. Step 5: Solve for x
    x = 548,648.65/720.43
  6. Step 6: Final answer
    x = 761.56

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1.5x scale

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.