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Finding the Fourth Proportional to 138,047.58, 190,504.71 and 78,431.58

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Solution

The fourth proportional to 138,047.58, 190,504.71 and 78,431.58 is: 108,235.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,047.58 : 190,504.71 = 78,431.58 : x
  2. Step 2: Convert to fraction form
    138,047.58/190,504.71 = 78,431.58/x
  3. Step 3: Cross multiply
    138,047.58x = 190,504.71 × 78,431.58
  4. Step 4: Simplify right side
    138,047.58x = 14,941,585,402.74
  5. Step 5: Solve for x
    x = 14,941,585,402.74/138,047.58
  6. Step 6: Final answer
    x = 108,235.04

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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.