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Finding the Fourth Proportional to 518,725.45, 715,826.86 and 289,289.71

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Solution

The fourth proportional to 518,725.45, 715,826.86 and 289,289.71 is: 399,211.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,725.45 : 715,826.86 = 289,289.71 : x
  2. Step 2: Convert to fraction form
    518,725.45/715,826.86 = 289,289.71/x
  3. Step 3: Cross multiply
    518,725.45x = 715,826.86 × 289,289.71
  4. Step 4: Simplify right side
    518,725.45x = 207,081,344,739.61
  5. Step 5: Solve for x
    x = 207,081,344,739.61/518,725.45
  6. Step 6: Final answer
    x = 399,211.85

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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.