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Finding the Fourth Proportional to 772.50, 1,066.05 and 423.18

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Solution

The fourth proportional to 772.50, 1,066.05 and 423.18 is: 583.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.50 : 1,066.05 = 423.18 : x
  2. Step 2: Convert to fraction form
    772.50/1,066.05 = 423.18/x
  3. Step 3: Cross multiply
    772.50x = 1,066.05 × 423.18
  4. Step 4: Simplify right side
    772.50x = 451,131.04
  5. Step 5: Solve for x
    x = 451,131.04/772.50
  6. Step 6: Final answer
    x = 583.99

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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.