Home / 312,905.88-469,417.20-142,139.59

Finding the Fourth Proportional to 312,905.88, 469,417.20 and 142,139.59

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Solution

The fourth proportional to 312,905.88, 469,417.20 and 142,139.59 is: 213,235.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,905.88 : 469,417.20 = 142,139.59 : x
  2. Step 2: Convert to fraction form
    312,905.88/469,417.20 = 142,139.59/x
  3. Step 3: Cross multiply
    312,905.88x = 469,417.20 × 142,139.59
  4. Step 4: Simplify right side
    312,905.88x = 66,722,768,346.95
  5. Step 5: Solve for x
    x = 66,722,768,346.95/312,905.88
  6. Step 6: Final answer
    x = 213,235.90

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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.