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Finding the Fourth Proportional to 166,428.78, 249,643.20 and 55,620.78

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Solution

The fourth proportional to 166,428.78, 249,643.20 and 55,620.78 is: 83,431.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    166,428.78 : 249,643.20 = 55,620.78 : x
  2. Step 2: Convert to fraction form
    166,428.78/249,643.20 = 55,620.78/x
  3. Step 3: Cross multiply
    166,428.78x = 249,643.20 × 55,620.78
  4. Step 4: Simplify right side
    166,428.78x = 13,885,349,505.70
  5. Step 5: Solve for x
    x = 13,885,349,505.70/166,428.78
  6. Step 6: Final answer
    x = 83,431.18

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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.