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Finding the Fourth Proportional to 519,890.38, 717,448.78 and 281,426.38

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Solution

The fourth proportional to 519,890.38, 717,448.78 and 281,426.38 is: 388,368.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,890.38 : 717,448.78 = 281,426.38 : x
  2. Step 2: Convert to fraction form
    519,890.38/717,448.78 = 281,426.38/x
  3. Step 3: Cross multiply
    519,890.38x = 717,448.78 × 281,426.38
  4. Step 4: Simplify right side
    519,890.38x = 201,909,012,990.82
  5. Step 5: Solve for x
    x = 201,909,012,990.82/519,890.38
  6. Step 6: Final answer
    x = 388,368.43

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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.