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Finding the Fourth Proportional to 518,723.45, 715,824.10 and 289,287.71

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Solution

The fourth proportional to 518,723.45, 715,824.10 and 289,287.71 is: 399,209.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,723.45 : 715,824.10 = 289,287.71 : x
  2. Step 2: Convert to fraction form
    518,723.45/715,824.10 = 289,287.71/x
  3. Step 3: Cross multiply
    518,723.45x = 715,824.10 × 289,287.71
  4. Step 4: Simplify right side
    518,723.45x = 207,079,114,651.81
  5. Step 5: Solve for x
    x = 207,079,114,651.81/518,723.45
  6. Step 6: Final answer
    x = 399,209.09

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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.