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Finding the Fourth Proportional to 139,776,019.20, 209,664,028.80 and 91,403,078.40

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Solution

The fourth proportional to 139,776,019.20, 209,664,028.80 and 91,403,078.40 is: 137,104,617.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,776,019.20 : 209,664,028.80 = 91,403,078.40 : x
  2. Step 2: Convert to fraction form
    139,776,019.20/209,664,028.80 = 91,403,078.40/x
  3. Step 3: Cross multiply
    139,776,019.20x = 209,664,028.80 × 91,403,078.40
  4. Step 4: Simplify right side
    139,776,019.20x = 19,163,937,662,066,260
  5. Step 5: Solve for x
    x = 19,163,937,662,066,260/139,776,019.20
  6. Step 6: Final answer
    x = 137,104,617.60

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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.