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Finding the Fourth Proportional to 143,309,672.70, 214,964,509.05 and 85,772,327.10

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Solution

The fourth proportional to 143,309,672.70, 214,964,509.05 and 85,772,327.10 is: 128,658,490.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,309,672.70 : 214,964,509.05 = 85,772,327.10 : x
  2. Step 2: Convert to fraction form
    143,309,672.70/214,964,509.05 = 85,772,327.10/x
  3. Step 3: Cross multiply
    143,309,672.70x = 214,964,509.05 × 85,772,327.10
  4. Step 4: Simplify right side
    143,309,672.70x = 18,438,006,185,127,508
  5. Step 5: Solve for x
    x = 18,438,006,185,127,508/143,309,672.70
  6. Step 6: Final answer
    x = 128,658,490.65

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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.