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Finding the Fourth Proportional to 663,835.67, 915,955.81 and 388,140.47

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Solution

The fourth proportional to 663,835.67, 915,955.81 and 388,140.47 is: 535,553.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,835.67 : 915,955.81 = 388,140.47 : x
  2. Step 2: Convert to fraction form
    663,835.67/915,955.81 = 388,140.47/x
  3. Step 3: Cross multiply
    663,835.67x = 915,955.81 × 388,140.47
  4. Step 4: Simplify right side
    663,835.67x = 355,519,518,592.63
  5. Step 5: Solve for x
    x = 355,519,518,592.63/663,835.67
  6. Step 6: Final answer
    x = 535,553.50

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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.