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Finding the Fourth Proportional to 518,728.39, 715,830.92 and 289,292.65

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Solution

The fourth proportional to 518,728.39, 715,830.92 and 289,292.65 is: 399,215.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,728.39 : 715,830.92 = 289,292.65 : x
  2. Step 2: Convert to fraction form
    518,728.39/715,830.92 = 289,292.65/x
  3. Step 3: Cross multiply
    518,728.39x = 715,830.92 × 289,292.65
  4. Step 4: Simplify right side
    518,728.39x = 207,084,621,647.55
  5. Step 5: Solve for x
    x = 207,084,621,647.55/518,728.39
  6. Step 6: Final answer
    x = 399,215.90

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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.