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Finding the Fourth Proportional to 909.83, 1,365.56 and 423.16

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Solution

The fourth proportional to 909.83, 1,365.56 and 423.16 is: 635.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.83 : 1,365.56 = 423.16 : x
  2. Step 2: Convert to fraction form
    909.83/1,365.56 = 423.16/x
  3. Step 3: Cross multiply
    909.83x = 1,365.56 × 423.16
  4. Step 4: Simplify right side
    909.83x = 577,846.43
  5. Step 5: Solve for x
    x = 577,846.43/909.83
  6. Step 6: Final answer
    x = 635.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.