Home / 428,278,847.52-642,416,981.04-121,571,220

Finding the Fourth Proportional to 428,278,847.52, 642,416,981.04 and 121,571,220

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Solution

The fourth proportional to 428,278,847.52, 642,416,981.04 and 121,571,220 is: 182,356,463.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,278,847.52 : 642,416,981.04 = 121,571,220 : x
  2. Step 2: Convert to fraction form
    428,278,847.52/642,416,981.04 = 121,571,220/x
  3. Step 3: Cross multiply
    428,278,847.52x = 642,416,981.04 × 121,571,220
  4. Step 4: Simplify right side
    428,278,847.52x = 78,099,416,133,749,664
  5. Step 5: Solve for x
    x = 78,099,416,133,749,664/428,278,847.52
  6. Step 6: Final answer
    x = 182,356,463.75

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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.