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Finding the Fourth Proportional to 415,511.80, 623,559.30 and 266,115.40

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Solution

The fourth proportional to 415,511.80, 623,559.30 and 266,115.40 is: 399,359.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,511.80 : 623,559.30 = 266,115.40 : x
  2. Step 2: Convert to fraction form
    415,511.80/623,559.30 = 266,115.40/x
  3. Step 3: Cross multiply
    415,511.80x = 623,559.30 × 266,115.40
  4. Step 4: Simplify right side
    415,511.80x = 165,938,732,543.22
  5. Step 5: Solve for x
    x = 165,938,732,543.22/415,511.80
  6. Step 6: Final answer
    x = 399,359.86

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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.