Home / 428,483.60-642,722.04-128,962.88

Finding the Fourth Proportional to 428,483.60, 642,722.04 and 128,962.88

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Solution

The fourth proportional to 428,483.60, 642,722.04 and 128,962.88 is: 193,443.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,483.60 : 642,722.04 = 128,962.88 : x
  2. Step 2: Convert to fraction form
    428,483.60/642,722.04 = 128,962.88/x
  3. Step 3: Cross multiply
    428,483.60x = 642,722.04 × 128,962.88
  4. Step 4: Simplify right side
    428,483.60x = 82,887,285,317.88
  5. Step 5: Solve for x
    x = 82,887,285,317.88/428,483.60
  6. Step 6: Final answer
    x = 193,443.31

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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.