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Finding the Fourth Proportional to 710,999.42, 981,179.12 and 388,709.43

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Solution

The fourth proportional to 710,999.42, 981,179.12 and 388,709.43 is: 536,418.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,999.42 : 981,179.12 = 388,709.43 : x
  2. Step 2: Convert to fraction form
    710,999.42/981,179.12 = 388,709.43/x
  3. Step 3: Cross multiply
    710,999.42x = 981,179.12 × 388,709.43
  4. Step 4: Simplify right side
    710,999.42x = 381,393,574,519.55
  5. Step 5: Solve for x
    x = 381,393,574,519.55/710,999.42
  6. Step 6: Final answer
    x = 536,418.97

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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.