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Finding the Fourth Proportional to 262,139.20, 392,917.20 and 143,895.40

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Solution

The fourth proportional to 262,139.20, 392,917.20 and 143,895.40 is: 215,683.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    262,139.20 : 392,917.20 = 143,895.40 : x
  2. Step 2: Convert to fraction form
    262,139.20/392,917.20 = 143,895.40/x
  3. Step 3: Cross multiply
    262,139.20x = 392,917.20 × 143,895.40
  4. Step 4: Simplify right side
    262,139.20x = 56,538,977,660.88
  5. Step 5: Solve for x
    x = 56,538,977,660.88/262,139.20
  6. Step 6: Final answer
    x = 215,683.03

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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.