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Finding the Fourth Proportional to 128,374.40, 177,161.51 and 71,785.64

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Solution

The fourth proportional to 128,374.40, 177,161.51 and 71,785.64 is: 99,066.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,374.40 : 177,161.51 = 71,785.64 : x
  2. Step 2: Convert to fraction form
    128,374.40/177,161.51 = 71,785.64/x
  3. Step 3: Cross multiply
    128,374.40x = 177,161.51 × 71,785.64
  4. Step 4: Simplify right side
    128,374.40x = 12,717,652,378.72
  5. Step 5: Solve for x
    x = 12,717,652,378.72/128,374.40
  6. Step 6: Final answer
    x = 99,066.89

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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.