Home / 428,341.34-642,487.17-128,815.40

Finding the Fourth Proportional to 428,341.34, 642,487.17 and 128,815.40

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Solution

The fourth proportional to 428,341.34, 642,487.17 and 128,815.40 is: 193,215.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,341.34 : 642,487.17 = 128,815.40 : x
  2. Step 2: Convert to fraction form
    428,341.34/642,487.17 = 128,815.40/x
  3. Step 3: Cross multiply
    428,341.34x = 642,487.17 × 128,815.40
  4. Step 4: Simplify right side
    428,341.34x = 82,762,241,798.42
  5. Step 5: Solve for x
    x = 82,762,241,798.42/428,341.34
  6. Step 6: Final answer
    x = 193,215.63

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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.