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Finding the Fourth Proportional to 645.24, 891.16 and 435.05

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Solution

The fourth proportional to 645.24, 891.16 and 435.05 is: 600.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.24 : 891.16 = 435.05 : x
  2. Step 2: Convert to fraction form
    645.24/891.16 = 435.05/x
  3. Step 3: Cross multiply
    645.24x = 891.16 × 435.05
  4. Step 4: Simplify right side
    645.24x = 387,699.16
  5. Step 5: Solve for x
    x = 387,699.16/645.24
  6. Step 6: Final answer
    x = 600.87

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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.