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Finding the Fourth Proportional to 138,690.85, 191,392.95 and 75,028.63

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Solution

The fourth proportional to 138,690.85, 191,392.95 and 75,028.63 is: 103,539.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,690.85 : 191,392.95 = 75,028.63 : x
  2. Step 2: Convert to fraction form
    138,690.85/191,392.95 = 75,028.63/x
  3. Step 3: Cross multiply
    138,690.85x = 191,392.95 × 75,028.63
  4. Step 4: Simplify right side
    138,690.85x = 14,359,950,830.16
  5. Step 5: Solve for x
    x = 14,359,950,830.16/138,690.85
  6. Step 6: Final answer
    x = 103,539.28

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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.