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Finding the Fourth Proportional to 1,294,999.90, 1,942,499.85 and 665,143.90

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Solution

The fourth proportional to 1,294,999.90, 1,942,499.85 and 665,143.90 is: 997,715.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294,999.90 : 1,942,499.85 = 665,143.90 : x
  2. Step 2: Convert to fraction form
    1,294,999.90/1,942,499.85 = 665,143.90/x
  3. Step 3: Cross multiply
    1,294,999.90x = 1,942,499.85 × 665,143.90
  4. Step 4: Simplify right side
    1,294,999.90x = 1,292,041,925,978.42
  5. Step 5: Solve for x
    x = 1,292,041,925,978.42/1,294,999.90
  6. Step 6: Final answer
    x = 997,715.85

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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.