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Finding the Fourth Proportional to 811.35, 1,120.19 and 624.49

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Solution

The fourth proportional to 811.35, 1,120.19 and 624.49 is: 862.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.35 : 1,120.19 = 624.49 : x
  2. Step 2: Convert to fraction form
    811.35/1,120.19 = 624.49/x
  3. Step 3: Cross multiply
    811.35x = 1,120.19 × 624.49
  4. Step 4: Simplify right side
    811.35x = 699,547.45
  5. Step 5: Solve for x
    x = 699,547.45/811.35
  6. Step 6: Final answer
    x = 862.20

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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.