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Finding the Fourth Proportional to 789.57, 1,089.45 and 474.75

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Solution

The fourth proportional to 789.57, 1,089.45 and 474.75 is: 655.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.57 : 1,089.45 = 474.75 : x
  2. Step 2: Convert to fraction form
    789.57/1,089.45 = 474.75/x
  3. Step 3: Cross multiply
    789.57x = 1,089.45 × 474.75
  4. Step 4: Simplify right side
    789.57x = 517,216.39
  5. Step 5: Solve for x
    x = 517,216.39/789.57
  6. Step 6: Final answer
    x = 655.06

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Double scale
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1.5x scale

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.