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Finding the Fourth Proportional to 663,833.92, 915,953.40 and 388,138.72

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Solution

The fourth proportional to 663,833.92, 915,953.40 and 388,138.72 is: 535,551.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,833.92 : 915,953.40 = 388,138.72 : x
  2. Step 2: Convert to fraction form
    663,833.92/915,953.40 = 388,138.72/x
  3. Step 3: Cross multiply
    663,833.92x = 915,953.40 × 388,138.72
  4. Step 4: Simplify right side
    663,833.92x = 355,516,980,255.65
  5. Step 5: Solve for x
    x = 355,516,980,255.65/663,833.92
  6. Step 6: Final answer
    x = 535,551.09

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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.