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Finding the Fourth Proportional to 627,431, 865,971.42 and 359,159

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Solution

The fourth proportional to 627,431, 865,971.42 and 359,159 is: 495,706.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    627,431 : 865,971.42 = 359,159 : x
  2. Step 2: Convert to fraction form
    627,431/865,971.42 = 359,159/x
  3. Step 3: Cross multiply
    627,431x = 865,971.42 × 359,159
  4. Step 4: Simplify right side
    627,431x = 311,021,429,235.78
  5. Step 5: Solve for x
    x = 311,021,429,235.78/627,431
  6. Step 6: Final answer
    x = 495,706.19

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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.