Home / 128,397.12-177,188.64-71,808.50

Finding the Fourth Proportional to 128,397.12, 177,188.64 and 71,808.50

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Solution

The fourth proportional to 128,397.12, 177,188.64 and 71,808.50 is: 99,096.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,397.12 : 177,188.64 = 71,808.50 : x
  2. Step 2: Convert to fraction form
    128,397.12/177,188.64 = 71,808.50/x
  3. Step 3: Cross multiply
    128,397.12x = 177,188.64 × 71,808.50
  4. Step 4: Simplify right side
    128,397.12x = 12,723,650,455.44
  5. Step 5: Solve for x
    x = 12,723,650,455.44/128,397.12
  6. Step 6: Final answer
    x = 99,096.07

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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.