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Finding the Fourth Proportional to 172,390.95, 237,748.09 and 120,681.56

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Solution

The fourth proportional to 172,390.95, 237,748.09 and 120,681.56 is: 166,434.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,390.95 : 237,748.09 = 120,681.56 : x
  2. Step 2: Convert to fraction form
    172,390.95/237,748.09 = 120,681.56/x
  3. Step 3: Cross multiply
    172,390.95x = 237,748.09 × 120,681.56
  4. Step 4: Simplify right side
    172,390.95x = 28,691,809,784.81
  5. Step 5: Solve for x
    x = 28,691,809,784.81/172,390.95
  6. Step 6: Final answer
    x = 166,434.55

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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.