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Finding the Fourth Proportional to 720.46, 992.28 and 622.18

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Solution

The fourth proportional to 720.46, 992.28 and 622.18 is: 856.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.46 : 992.28 = 622.18 : x
  2. Step 2: Convert to fraction form
    720.46/992.28 = 622.18/x
  3. Step 3: Cross multiply
    720.46x = 992.28 × 622.18
  4. Step 4: Simplify right side
    720.46x = 617,376.77
  5. Step 5: Solve for x
    x = 617,376.77/720.46
  6. Step 6: Final answer
    x = 856.92

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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.