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Finding the Fourth Proportional to 640,915.20, 960,105.60 and 562,118.40

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Solution

The fourth proportional to 640,915.20, 960,105.60 and 562,118.40 is: 842,066.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,915.20 : 960,105.60 = 562,118.40 : x
  2. Step 2: Convert to fraction form
    640,915.20/960,105.60 = 562,118.40/x
  3. Step 3: Cross multiply
    640,915.20x = 960,105.60 × 562,118.40
  4. Step 4: Simplify right side
    640,915.20x = 539,693,023,703.04
  5. Step 5: Solve for x
    x = 539,693,023,703.04/640,915.20
  6. Step 6: Final answer
    x = 842,066.19

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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.