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Finding the Fourth Proportional to 251,681.78, 347,320.90 and 138,504.53

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Solution

The fourth proportional to 251,681.78, 347,320.90 and 138,504.53 is: 191,136.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    251,681.78 : 347,320.90 = 138,504.53 : x
  2. Step 2: Convert to fraction form
    251,681.78/347,320.90 = 138,504.53/x
  3. Step 3: Cross multiply
    251,681.78x = 347,320.90 × 138,504.53
  4. Step 4: Simplify right side
    251,681.78x = 48,105,518,013.68
  5. Step 5: Solve for x
    x = 48,105,518,013.68/251,681.78
  6. Step 6: Final answer
    x = 191,136.28

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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.