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Finding the Fourth Proportional to 919,711.91, 1,379,919 and 358,790.15

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Solution

The fourth proportional to 919,711.91, 1,379,919 and 358,790.15 is: 538,322.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    919,711.91 : 1,379,919 = 358,790.15 : x
  2. Step 2: Convert to fraction form
    919,711.91/1,379,919 = 358,790.15/x
  3. Step 3: Cross multiply
    919,711.91x = 1,379,919 × 358,790.15
  4. Step 4: Simplify right side
    919,711.91x = 495,101,344,997.85
  5. Step 5: Solve for x
    x = 495,101,344,997.85/919,711.91
  6. Step 6: Final answer
    x = 538,322.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.