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Finding the Fourth Proportional to 879,758.40, 1,318,762.80 and 405,616.80

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Solution

The fourth proportional to 879,758.40, 1,318,762.80 and 405,616.80 is: 608,021.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,758.40 : 1,318,762.80 = 405,616.80 : x
  2. Step 2: Convert to fraction form
    879,758.40/1,318,762.80 = 405,616.80/x
  3. Step 3: Cross multiply
    879,758.40x = 1,318,762.80 × 405,616.80
  4. Step 4: Simplify right side
    879,758.40x = 534,912,346,895.04
  5. Step 5: Solve for x
    x = 534,912,346,895.04/879,758.40
  6. Step 6: Final answer
    x = 608,021.87

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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.