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Finding the Fourth Proportional to 653,479.84, 978,509.04 and 428,131.36

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Solution

The fourth proportional to 653,479.84, 978,509.04 and 428,131.36 is: 641,076.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    653,479.84 : 978,509.04 = 428,131.36 : x
  2. Step 2: Convert to fraction form
    653,479.84/978,509.04 = 428,131.36/x
  3. Step 3: Cross multiply
    653,479.84x = 978,509.04 × 428,131.36
  4. Step 4: Simplify right side
    653,479.84x = 418,930,406,067.49
  5. Step 5: Solve for x
    x = 418,930,406,067.49/653,479.84
  6. Step 6: Final answer
    x = 641,076.25

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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.