Home / 128,861.45-177,837.68-72,276.47

Finding the Fourth Proportional to 128,861.45, 177,837.68 and 72,276.47

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Solution

The fourth proportional to 128,861.45, 177,837.68 and 72,276.47 is: 99,746.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,861.45 : 177,837.68 = 72,276.47 : x
  2. Step 2: Convert to fraction form
    128,861.45/177,837.68 = 72,276.47/x
  3. Step 3: Cross multiply
    128,861.45x = 177,837.68 × 72,276.47
  4. Step 4: Simplify right side
    128,861.45x = 12,853,479,430.75
  5. Step 5: Solve for x
    x = 12,853,479,430.75/128,861.45
  6. Step 6: Final answer
    x = 99,746.51

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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.