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Finding the Fourth Proportional to 879,279.80, 1,318,530.90 and 405,721.40

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Solution

The fourth proportional to 879,279.80, 1,318,530.90 and 405,721.40 is: 608,402.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,279.80 : 1,318,530.90 = 405,721.40 : x
  2. Step 2: Convert to fraction form
    879,279.80/1,318,530.90 = 405,721.40/x
  3. Step 3: Cross multiply
    879,279.80x = 1,318,530.90 × 405,721.40
  4. Step 4: Simplify right side
    879,279.80x = 534,956,202,691.26
  5. Step 5: Solve for x
    x = 534,956,202,691.26/879,279.80
  6. Step 6: Final answer
    x = 608,402.70

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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.