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Finding the Fourth Proportional to 138,373.96, 190,930.69 and 77,931.66

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Solution

The fourth proportional to 138,373.96, 190,930.69 and 77,931.66 is: 107,531.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,373.96 : 190,930.69 = 77,931.66 : x
  2. Step 2: Convert to fraction form
    138,373.96/190,930.69 = 77,931.66/x
  3. Step 3: Cross multiply
    138,373.96x = 190,930.69 × 77,931.66
  4. Step 4: Simplify right side
    138,373.96x = 14,879,544,998.07
  5. Step 5: Solve for x
    x = 14,879,544,998.07/138,373.96
  6. Step 6: Final answer
    x = 107,531.40

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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.