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Finding the Fourth Proportional to 139,648.16, 192,715.80 and 79,216.76

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Solution

The fourth proportional to 139,648.16, 192,715.80 and 79,216.76 is: 109,319.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,648.16 : 192,715.80 = 79,216.76 : x
  2. Step 2: Convert to fraction form
    139,648.16/192,715.80 = 79,216.76/x
  3. Step 3: Cross multiply
    139,648.16x = 192,715.80 × 79,216.76
  4. Step 4: Simplify right side
    139,648.16x = 15,266,321,276.81
  5. Step 5: Solve for x
    x = 15,266,321,276.81/139,648.16
  6. Step 6: Final answer
    x = 109,319.89

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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.