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Finding the Fourth Proportional to 3,887,487.64, 5,831,189.34 and 1,328,678.20

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Solution

The fourth proportional to 3,887,487.64, 5,831,189.34 and 1,328,678.20 is: 1,993,002.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,887,487.64 : 5,831,189.34 = 1,328,678.20 : x
  2. Step 2: Convert to fraction form
    3,887,487.64/5,831,189.34 = 1,328,678.20/x
  3. Step 3: Cross multiply
    3,887,487.64x = 5,831,189.34 × 1,328,678.20
  4. Step 4: Simplify right side
    3,887,487.64x = 7,747,774,156,130.39
  5. Step 5: Solve for x
    x = 7,747,774,156,130.39/3,887,487.64
  6. Step 6: Final answer
    x = 1,993,002.90

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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.