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Finding the Fourth Proportional to 790.16, 1,089.84 and 624.08

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Solution

The fourth proportional to 790.16, 1,089.84 and 624.08 is: 860.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.16 : 1,089.84 = 624.08 : x
  2. Step 2: Convert to fraction form
    790.16/1,089.84 = 624.08/x
  3. Step 3: Cross multiply
    790.16x = 1,089.84 × 624.08
  4. Step 4: Simplify right side
    790.16x = 680,147.35
  5. Step 5: Solve for x
    x = 680,147.35/790.16
  6. Step 6: Final answer
    x = 860.77

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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.