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Finding the Fourth Proportional to 139,254.66, 192,117.62 and 78,811.45

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Solution

The fourth proportional to 139,254.66, 192,117.62 and 78,811.45 is: 108,729.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,254.66 : 192,117.62 = 78,811.45 : x
  2. Step 2: Convert to fraction form
    139,254.66/192,117.62 = 78,811.45/x
  3. Step 3: Cross multiply
    139,254.66x = 192,117.62 × 78,811.45
  4. Step 4: Simplify right side
    139,254.66x = 15,141,066,848.10
  5. Step 5: Solve for x
    x = 15,141,066,848.10/139,254.66
  6. Step 6: Final answer
    x = 108,729.34

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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.