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Finding the Fourth Proportional to 139,008.08, 191,679 and 103,264.40

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Solution

The fourth proportional to 139,008.08, 191,679 and 103,264.40 is: 142,391.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,008.08 : 191,679 = 103,264.40 : x
  2. Step 2: Convert to fraction form
    139,008.08/191,679 = 103,264.40/x
  3. Step 3: Cross multiply
    139,008.08x = 191,679 × 103,264.40
  4. Step 4: Simplify right side
    139,008.08x = 19,793,616,927.60
  5. Step 5: Solve for x
    x = 19,793,616,927.60/139,008.08
  6. Step 6: Final answer
    x = 142,391.84

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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.