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Finding the Fourth Proportional to 720.45, 1,079.91 and 501.12

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Solution

The fourth proportional to 720.45, 1,079.91 and 501.12 is: 751.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.45 : 1,079.91 = 501.12 : x
  2. Step 2: Convert to fraction form
    720.45/1,079.91 = 501.12/x
  3. Step 3: Cross multiply
    720.45x = 1,079.91 × 501.12
  4. Step 4: Simplify right side
    720.45x = 541,164.50
  5. Step 5: Solve for x
    x = 541,164.50/720.45
  6. Step 6: Final answer
    x = 751.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.