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Finding the Fourth Proportional to 720.34, 992.79 and 580.90

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Solution

The fourth proportional to 720.34, 992.79 and 580.90 is: 800.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.34 : 992.79 = 580.90 : x
  2. Step 2: Convert to fraction form
    720.34/992.79 = 580.90/x
  3. Step 3: Cross multiply
    720.34x = 992.79 × 580.90
  4. Step 4: Simplify right side
    720.34x = 576,711.71
  5. Step 5: Solve for x
    x = 576,711.71/720.34
  6. Step 6: Final answer
    x = 800.61

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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.