Home / 428,627.40-642,941.10-387,293.10

Finding the Fourth Proportional to 428,627.40, 642,941.10 and 387,293.10

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Solution

The fourth proportional to 428,627.40, 642,941.10 and 387,293.10 is: 580,939.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,627.40 : 642,941.10 = 387,293.10 : x
  2. Step 2: Convert to fraction form
    428,627.40/642,941.10 = 387,293.10/x
  3. Step 3: Cross multiply
    428,627.40x = 642,941.10 × 387,293.10
  4. Step 4: Simplify right side
    428,627.40x = 249,006,651,736.41
  5. Step 5: Solve for x
    x = 249,006,651,736.41/428,627.40
  6. Step 6: Final answer
    x = 580,939.65

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Similar ratio
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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.