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Finding the Fourth Proportional to 266,685.12, 399,872.16 and 79,646.40

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Solution

The fourth proportional to 266,685.12, 399,872.16 and 79,646.40 is: 119,423.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,685.12 : 399,872.16 = 79,646.40 : x
  2. Step 2: Convert to fraction form
    266,685.12/399,872.16 = 79,646.40/x
  3. Step 3: Cross multiply
    266,685.12x = 399,872.16 × 79,646.40
  4. Step 4: Simplify right side
    266,685.12x = 31,848,378,004.22
  5. Step 5: Solve for x
    x = 31,848,378,004.22/266,685.12
  6. Step 6: Final answer
    x = 119,423.15

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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.