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Finding the Fourth Proportional to 128,079.56, 176,756.64 and 74,381.42

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Solution

The fourth proportional to 128,079.56, 176,756.64 and 74,381.42 is: 102,650.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,079.56 : 176,756.64 = 74,381.42 : x
  2. Step 2: Convert to fraction form
    128,079.56/176,756.64 = 74,381.42/x
  3. Step 3: Cross multiply
    128,079.56x = 176,756.64 × 74,381.42
  4. Step 4: Simplify right side
    128,079.56x = 13,147,409,877.63
  5. Step 5: Solve for x
    x = 13,147,409,877.63/128,079.56
  6. Step 6: Final answer
    x = 102,650.34

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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.