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Finding the Fourth Proportional to 139,163,217.39, 192,039,978.39 and 77,287,541.76

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Solution

The fourth proportional to 139,163,217.39, 192,039,978.39 and 77,287,541.76 is: 106,653,885.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,163,217.39 : 192,039,978.39 = 77,287,541.76 : x
  2. Step 2: Convert to fraction form
    139,163,217.39/192,039,978.39 = 77,287,541.76/x
  3. Step 3: Cross multiply
    139,163,217.39x = 192,039,978.39 × 77,287,541.76
  4. Step 4: Simplify right side
    139,163,217.39x = 14,842,297,849,406,622
  5. Step 5: Solve for x
    x = 14,842,297,849,406,622/139,163,217.39
  6. Step 6: Final answer
    x = 106,653,885.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.