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Finding the Fourth Proportional to 876,859.60, 1,315,289.40 and 315,912.40

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Solution

The fourth proportional to 876,859.60, 1,315,289.40 and 315,912.40 is: 473,868.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    876,859.60 : 1,315,289.40 = 315,912.40 : x
  2. Step 2: Convert to fraction form
    876,859.60/1,315,289.40 = 315,912.40/x
  3. Step 3: Cross multiply
    876,859.60x = 1,315,289.40 × 315,912.40
  4. Step 4: Simplify right side
    876,859.60x = 415,516,231,048.56
  5. Step 5: Solve for x
    x = 415,516,231,048.56/876,859.60
  6. Step 6: Final answer
    x = 473,868.60

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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.