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Finding the Fourth Proportional to 715,847.78, 987,865.78 and 405,808.87

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Solution

The fourth proportional to 715,847.78, 987,865.78 and 405,808.87 is: 560,013.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,847.78 : 987,865.78 = 405,808.87 : x
  2. Step 2: Convert to fraction form
    715,847.78/987,865.78 = 405,808.87/x
  3. Step 3: Cross multiply
    715,847.78x = 987,865.78 × 405,808.87
  4. Step 4: Simplify right side
    715,847.78x = 400,884,697,633.67
  5. Step 5: Solve for x
    x = 400,884,697,633.67/715,847.78
  6. Step 6: Final answer
    x = 560,013.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.