Home / 428,416.70-642,679.72-143,985.20

Finding the Fourth Proportional to 428,416.70, 642,679.72 and 143,985.20

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Solution

The fourth proportional to 428,416.70, 642,679.72 and 143,985.20 is: 215,996.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,416.70 : 642,679.72 = 143,985.20 : x
  2. Step 2: Convert to fraction form
    428,416.70/642,679.72 = 143,985.20/x
  3. Step 3: Cross multiply
    428,416.70x = 642,679.72 × 143,985.20
  4. Step 4: Simplify right side
    428,416.70x = 92,536,364,446.78
  5. Step 5: Solve for x
    x = 92,536,364,446.78/428,416.70
  6. Step 6: Final answer
    x = 215,996.17

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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.