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Finding the Fourth Proportional to 715.28, 987.09 and 435.53

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Solution

The fourth proportional to 715.28, 987.09 and 435.53 is: 601.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.28 : 987.09 = 435.53 : x
  2. Step 2: Convert to fraction form
    715.28/987.09 = 435.53/x
  3. Step 3: Cross multiply
    715.28x = 987.09 × 435.53
  4. Step 4: Simplify right side
    715.28x = 429,902.37
  5. Step 5: Solve for x
    x = 429,902.37/715.28
  6. Step 6: Final answer
    x = 601.03

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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.