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Finding the Fourth Proportional to 720.85, 995.72 and 581.50

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Solution

The fourth proportional to 720.85, 995.72 and 581.50 is: 803.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.85 : 995.72 = 581.50 : x
  2. Step 2: Convert to fraction form
    720.85/995.72 = 581.50/x
  3. Step 3: Cross multiply
    720.85x = 995.72 × 581.50
  4. Step 4: Simplify right side
    720.85x = 579,011.18
  5. Step 5: Solve for x
    x = 579,011.18/720.85
  6. Step 6: Final answer
    x = 803.23

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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.