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Finding the Fourth Proportional to 720.59, 995.45 and 631.89

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Solution

The fourth proportional to 720.59, 995.45 and 631.89 is: 872.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.59 : 995.45 = 631.89 : x
  2. Step 2: Convert to fraction form
    720.59/995.45 = 631.89/x
  3. Step 3: Cross multiply
    720.59x = 995.45 × 631.89
  4. Step 4: Simplify right side
    720.59x = 629,011.74
  5. Step 5: Solve for x
    x = 629,011.74/720.59
  6. Step 6: Final answer
    x = 872.92

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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.