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Finding the Fourth Proportional to 138,674.60, 208,011.90 and 121,567.40

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Solution

The fourth proportional to 138,674.60, 208,011.90 and 121,567.40 is: 182,351.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,674.60 : 208,011.90 = 121,567.40 : x
  2. Step 2: Convert to fraction form
    138,674.60/208,011.90 = 121,567.40/x
  3. Step 3: Cross multiply
    138,674.60x = 208,011.90 × 121,567.40
  4. Step 4: Simplify right side
    138,674.60x = 25,287,465,852.06
  5. Step 5: Solve for x
    x = 25,287,465,852.06/138,674.60
  6. Step 6: Final answer
    x = 182,351.10

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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.