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Finding the Fourth Proportional to 663,834.67, 915,954.44 and 388,139.47

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Solution

The fourth proportional to 663,834.67, 915,954.44 and 388,139.47 is: 535,552.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,834.67 : 915,954.44 = 388,139.47 : x
  2. Step 2: Convert to fraction form
    663,834.67/915,954.44 = 388,139.47/x
  3. Step 3: Cross multiply
    663,834.67x = 915,954.44 × 388,139.47
  4. Step 4: Simplify right side
    663,834.67x = 355,518,068,945.05
  5. Step 5: Solve for x
    x = 355,518,068,945.05/663,834.67
  6. Step 6: Final answer
    x = 535,552.13

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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.