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Finding the Fourth Proportional to 266,638.40, 399,811.80 and 108,688.40

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Solution

The fourth proportional to 266,638.40, 399,811.80 and 108,688.40 is: 162,973.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,638.40 : 399,811.80 = 108,688.40 : x
  2. Step 2: Convert to fraction form
    266,638.40/399,811.80 = 108,688.40/x
  3. Step 3: Cross multiply
    266,638.40x = 399,811.80 × 108,688.40
  4. Step 4: Simplify right side
    266,638.40x = 43,454,904,843.12
  5. Step 5: Solve for x
    x = 43,454,904,843.12/266,638.40
  6. Step 6: Final answer
    x = 162,973.17

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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.