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Finding the Fourth Proportional to 266,103.20, 399,268.20 and 139,840.40

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Solution

The fourth proportional to 266,103.20, 399,268.20 and 139,840.40 is: 209,820.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,103.20 : 399,268.20 = 139,840.40 : x
  2. Step 2: Convert to fraction form
    266,103.20/399,268.20 = 139,840.40/x
  3. Step 3: Cross multiply
    266,103.20x = 399,268.20 × 139,840.40
  4. Step 4: Simplify right side
    266,103.20x = 55,833,824,795.28
  5. Step 5: Solve for x
    x = 55,833,824,795.28/266,103.20
  6. Step 6: Final answer
    x = 209,820.19

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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.