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Finding the Fourth Proportional to 710,986.55, 981,164.90 and 388,696.66

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Solution

The fourth proportional to 710,986.55, 981,164.90 and 388,696.66 is: 536,403.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,986.55 : 981,164.90 = 388,696.66 : x
  2. Step 2: Convert to fraction form
    710,986.55/981,164.90 = 388,696.66/x
  3. Step 3: Cross multiply
    710,986.55x = 981,164.90 × 388,696.66
  4. Step 4: Simplify right side
    710,986.55x = 381,375,521,239.78
  5. Step 5: Solve for x
    x = 381,375,521,239.78/710,986.55
  6. Step 6: Final answer
    x = 536,403.29

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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.