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Finding the Fourth Proportional to 622.68, 859.88 and 402.02

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Solution

The fourth proportional to 622.68, 859.88 and 402.02 is: 555.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.68 : 859.88 = 402.02 : x
  2. Step 2: Convert to fraction form
    622.68/859.88 = 402.02/x
  3. Step 3: Cross multiply
    622.68x = 859.88 × 402.02
  4. Step 4: Simplify right side
    622.68x = 345,688.96
  5. Step 5: Solve for x
    x = 345,688.96/622.68
  6. Step 6: Final answer
    x = 555.16

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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.