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Finding the Fourth Proportional to 520,717.90, 718,556.86 and 291,235.45

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Solution

The fourth proportional to 520,717.90, 718,556.86 and 291,235.45 is: 401,885.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,717.90 : 718,556.86 = 291,235.45 : x
  2. Step 2: Convert to fraction form
    520,717.90/718,556.86 = 291,235.45/x
  3. Step 3: Cross multiply
    520,717.90x = 718,556.86 × 291,235.45
  4. Step 4: Simplify right side
    520,717.90x = 209,269,230,472.69
  5. Step 5: Solve for x
    x = 209,269,230,472.69/520,717.90
  6. Step 6: Final answer
    x = 401,885.99

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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.