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Finding the Fourth Proportional to 486,145.80, 729,218.70 and 317,856.15

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Solution

The fourth proportional to 486,145.80, 729,218.70 and 317,856.15 is: 476,784.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,145.80 : 729,218.70 = 317,856.15 : x
  2. Step 2: Convert to fraction form
    486,145.80/729,218.70 = 317,856.15/x
  3. Step 3: Cross multiply
    486,145.80x = 729,218.70 × 317,856.15
  4. Step 4: Simplify right side
    486,145.80x = 231,786,648,490.01
  5. Step 5: Solve for x
    x = 231,786,648,490.01/486,145.80
  6. Step 6: Final answer
    x = 476,784.23

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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.