Home / 138,819,811.20-208,087,999.20-81,282,465.60

Finding the Fourth Proportional to 138,819,811.20, 208,087,999.20 and 81,282,465.60

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Solution

The fourth proportional to 138,819,811.20, 208,087,999.20 and 81,282,465.60 is: 121,840,719.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,819,811.20 : 208,087,999.20 = 81,282,465.60 : x
  2. Step 2: Convert to fraction form
    138,819,811.20/208,087,999.20 = 81,282,465.60/x
  3. Step 3: Cross multiply
    138,819,811.20x = 208,087,999.20 × 81,282,465.60
  4. Step 4: Simplify right side
    138,819,811.20x = 16,913,905,636,746,826
  5. Step 5: Solve for x
    x = 16,913,905,636,746,826/138,819,811.20
  6. Step 6: Final answer
    x = 121,840,719.21

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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.