Home / 428,821.12-642,777.72-144,240.76

Finding the Fourth Proportional to 428,821.12, 642,777.72 and 144,240.76

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Solution

The fourth proportional to 428,821.12, 642,777.72 and 144,240.76 is: 216,208.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,821.12 : 642,777.72 = 144,240.76 : x
  2. Step 2: Convert to fraction form
    428,821.12/642,777.72 = 144,240.76/x
  3. Step 3: Cross multiply
    428,821.12x = 642,777.72 × 144,240.76
  4. Step 4: Simplify right side
    428,821.12x = 92,714,746,843.87
  5. Step 5: Solve for x
    x = 92,714,746,843.87/428,821.12
  6. Step 6: Final answer
    x = 216,208.44

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1.5x scale

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.