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Finding the Fourth Proportional to 139,316.64, 192,357.12 and 85,673.76

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Solution

The fourth proportional to 139,316.64, 192,357.12 and 85,673.76 is: 118,291.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,316.64 : 192,357.12 = 85,673.76 : x
  2. Step 2: Convert to fraction form
    139,316.64/192,357.12 = 85,673.76/x
  3. Step 3: Cross multiply
    139,316.64x = 192,357.12 × 85,673.76
  4. Step 4: Simplify right side
    139,316.64x = 16,479,957,733.17
  5. Step 5: Solve for x
    x = 16,479,957,733.17/139,316.64
  6. Step 6: Final answer
    x = 118,291.38

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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.