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Finding the Fourth Proportional to 788.04, 1,087.91 and 620.10

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Solution

The fourth proportional to 788.04, 1,087.91 and 620.10 is: 856.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.04 : 1,087.91 = 620.10 : x
  2. Step 2: Convert to fraction form
    788.04/1,087.91 = 620.10/x
  3. Step 3: Cross multiply
    788.04x = 1,087.91 × 620.10
  4. Step 4: Simplify right side
    788.04x = 674,612.99
  5. Step 5: Solve for x
    x = 674,612.99/788.04
  6. Step 6: Final answer
    x = 856.06

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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.