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Finding the Fourth Proportional to 139,985.71, 209,830.02 and 68,807.97

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Solution

The fourth proportional to 139,985.71, 209,830.02 and 68,807.97 is: 103,138.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,985.71 : 209,830.02 = 68,807.97 : x
  2. Step 2: Convert to fraction form
    139,985.71/209,830.02 = 68,807.97/x
  3. Step 3: Cross multiply
    139,985.71x = 209,830.02 × 68,807.97
  4. Step 4: Simplify right side
    139,985.71x = 14,437,977,721.26
  5. Step 5: Solve for x
    x = 14,437,977,721.26/139,985.71
  6. Step 6: Final answer
    x = 103,138.94

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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.