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Finding the Fourth Proportional to 426,037.80, 639,056.70 and 126,564.60

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Solution

The fourth proportional to 426,037.80, 639,056.70 and 126,564.60 is: 189,846.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,037.80 : 639,056.70 = 126,564.60 : x
  2. Step 2: Convert to fraction form
    426,037.80/639,056.70 = 126,564.60/x
  3. Step 3: Cross multiply
    426,037.80x = 639,056.70 × 126,564.60
  4. Step 4: Simplify right side
    426,037.80x = 80,881,955,612.82
  5. Step 5: Solve for x
    x = 80,881,955,612.82/426,037.80
  6. Step 6: Final answer
    x = 189,846.90

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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.