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Finding the Fourth Proportional to 166,117.90, 249,213.30 and 81,918.40

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Solution

The fourth proportional to 166,117.90, 249,213.30 and 81,918.40 is: 122,895.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    166,117.90 : 249,213.30 = 81,918.40 : x
  2. Step 2: Convert to fraction form
    166,117.90/249,213.30 = 81,918.40/x
  3. Step 3: Cross multiply
    166,117.90x = 249,213.30 × 81,918.40
  4. Step 4: Simplify right side
    166,117.90x = 20,415,154,794.72
  5. Step 5: Solve for x
    x = 20,415,154,794.72/166,117.90
  6. Step 6: Final answer
    x = 122,895.57

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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.