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Finding the Fourth Proportional to 127,939,655.80, 191,909,483.70 and 84,857,505.40

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Solution

The fourth proportional to 127,939,655.80, 191,909,483.70 and 84,857,505.40 is: 127,286,258.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,939,655.80 : 191,909,483.70 = 84,857,505.40 : x
  2. Step 2: Convert to fraction form
    127,939,655.80/191,909,483.70 = 84,857,505.40/x
  3. Step 3: Cross multiply
    127,939,655.80x = 191,909,483.70 × 84,857,505.40
  4. Step 4: Simplify right side
    127,939,655.80x = 16,284,960,049,383,962
  5. Step 5: Solve for x
    x = 16,284,960,049,383,962/127,939,655.80
  6. Step 6: Final answer
    x = 127,286,258.10

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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.