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Finding the Fourth Proportional to 955.68, 1,431.78 and 436.11

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Solution

The fourth proportional to 955.68, 1,431.78 and 436.11 is: 653.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.68 : 1,431.78 = 436.11 : x
  2. Step 2: Convert to fraction form
    955.68/1,431.78 = 436.11/x
  3. Step 3: Cross multiply
    955.68x = 1,431.78 × 436.11
  4. Step 4: Simplify right side
    955.68x = 624,417.08
  5. Step 5: Solve for x
    x = 624,417.08/955.68
  6. Step 6: Final answer
    x = 653.38

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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.