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Finding the Fourth Proportional to 518,345.40, 715,323.80 and 288,896.28

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Solution

The fourth proportional to 518,345.40, 715,323.80 and 288,896.28 is: 398,680.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,345.40 : 715,323.80 = 288,896.28 : x
  2. Step 2: Convert to fraction form
    518,345.40/715,323.80 = 288,896.28/x
  3. Step 3: Cross multiply
    518,345.40x = 715,323.80 × 288,896.28
  4. Step 4: Simplify right side
    518,345.40x = 206,654,384,815.46
  5. Step 5: Solve for x
    x = 206,654,384,815.46/518,345.40
  6. Step 6: Final answer
    x = 398,680.85

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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.