Home / 428,326.47-642,491.19-108,478.26

Finding the Fourth Proportional to 428,326.47, 642,491.19 and 108,478.26

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Solution

The fourth proportional to 428,326.47, 642,491.19 and 108,478.26 is: 162,717.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,326.47 : 642,491.19 = 108,478.26 : x
  2. Step 2: Convert to fraction form
    428,326.47/642,491.19 = 108,478.26/x
  3. Step 3: Cross multiply
    428,326.47x = 642,491.19 × 108,478.26
  4. Step 4: Simplify right side
    428,326.47x = 69,696,326,356.53
  5. Step 5: Solve for x
    x = 69,696,326,356.53/428,326.47
  6. Step 6: Final answer
    x = 162,717.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.