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Finding the Fourth Proportional to 659,435.78, 987,603.57 and 321,417.11

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Solution

The fourth proportional to 659,435.78, 987,603.57 and 321,417.11 is: 481,370.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,435.78 : 987,603.57 = 321,417.11 : x
  2. Step 2: Convert to fraction form
    659,435.78/987,603.57 = 321,417.11/x
  3. Step 3: Cross multiply
    659,435.78x = 987,603.57 × 321,417.11
  4. Step 4: Simplify right side
    659,435.78x = 317,432,680,357.07
  5. Step 5: Solve for x
    x = 317,432,680,357.07/659,435.78
  6. Step 6: Final answer
    x = 481,370.12

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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.