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Finding the Fourth Proportional to 138,395.39, 190,999.75 and 84,715.88

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Solution

The fourth proportional to 138,395.39, 190,999.75 and 84,715.88 is: 116,916.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,395.39 : 190,999.75 = 84,715.88 : x
  2. Step 2: Convert to fraction form
    138,395.39/190,999.75 = 84,715.88/x
  3. Step 3: Cross multiply
    138,395.39x = 190,999.75 × 84,715.88
  4. Step 4: Simplify right side
    138,395.39x = 16,180,712,484.42
  5. Step 5: Solve for x
    x = 16,180,712,484.42/138,395.39
  6. Step 6: Final answer
    x = 116,916.55

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1.5x scale

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.