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Finding the Fourth Proportional to 640,578.40, 960,061.20 and 325,122.40

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Solution

The fourth proportional to 640,578.40, 960,061.20 and 325,122.40 is: 487,274.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,578.40 : 960,061.20 = 325,122.40 : x
  2. Step 2: Convert to fraction form
    640,578.40/960,061.20 = 325,122.40/x
  3. Step 3: Cross multiply
    640,578.40x = 960,061.20 × 325,122.40
  4. Step 4: Simplify right side
    640,578.40x = 312,137,401,490.88
  5. Step 5: Solve for x
    x = 312,137,401,490.88/640,578.40
  6. Step 6: Final answer
    x = 487,274.32

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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.