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Finding the Fourth Proportional to 138,985.76, 191,800.32 and 75,323.55

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Solution

The fourth proportional to 138,985.76, 191,800.32 and 75,323.55 is: 103,946.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,985.76 : 191,800.32 = 75,323.55 : x
  2. Step 2: Convert to fraction form
    138,985.76/191,800.32 = 75,323.55/x
  3. Step 3: Cross multiply
    138,985.76x = 191,800.32 × 75,323.55
  4. Step 4: Simplify right side
    138,985.76x = 14,447,080,993.54
  5. Step 5: Solve for x
    x = 14,447,080,993.54/138,985.76
  6. Step 6: Final answer
    x = 103,946.49

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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.