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Finding the Fourth Proportional to 1,315,260.64, 1,971,724.56 and 640,964.80

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Solution

The fourth proportional to 1,315,260.64, 1,971,724.56 and 640,964.80 is: 960,878.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315,260.64 : 1,971,724.56 = 640,964.80 : x
  2. Step 2: Convert to fraction form
    1,315,260.64/1,971,724.56 = 640,964.80/x
  3. Step 3: Cross multiply
    1,315,260.64x = 1,971,724.56 × 640,964.80
  4. Step 4: Simplify right side
    1,315,260.64x = 1,263,806,038,255.49
  5. Step 5: Solve for x
    x = 1,263,806,038,255.49/1,315,260.64
  6. Step 6: Final answer
    x = 960,878.78

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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.