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Finding the Fourth Proportional to 1,065.32, 1,469.76 and 622.88

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Solution

The fourth proportional to 1,065.32, 1,469.76 and 622.88 is: 859.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.32 : 1,469.76 = 622.88 : x
  2. Step 2: Convert to fraction form
    1,065.32/1,469.76 = 622.88/x
  3. Step 3: Cross multiply
    1,065.32x = 1,469.76 × 622.88
  4. Step 4: Simplify right side
    1,065.32x = 915,484.11
  5. Step 5: Solve for x
    x = 915,484.11/1,065.32
  6. Step 6: Final answer
    x = 859.35

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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.