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Finding the Fourth Proportional to 790.09, 1,089.78 and 624.04

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Solution

The fourth proportional to 790.09, 1,089.78 and 624.04 is: 860.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.09 : 1,089.78 = 624.04 : x
  2. Step 2: Convert to fraction form
    790.09/1,089.78 = 624.04/x
  3. Step 3: Cross multiply
    790.09x = 1,089.78 × 624.04
  4. Step 4: Simplify right side
    790.09x = 680,066.31
  5. Step 5: Solve for x
    x = 680,066.31/790.09
  6. Step 6: Final answer
    x = 860.75

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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.