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Finding the Fourth Proportional to 128,368.92, 177,145.74 and 71,785.56

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Solution

The fourth proportional to 128,368.92, 177,145.74 and 71,785.56 is: 99,062.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,368.92 : 177,145.74 = 71,785.56 : x
  2. Step 2: Convert to fraction form
    128,368.92/177,145.74 = 71,785.56/x
  3. Step 3: Cross multiply
    128,368.92x = 177,145.74 × 71,785.56
  4. Step 4: Simplify right side
    128,368.92x = 12,716,506,147.51
  5. Step 5: Solve for x
    x = 12,716,506,147.51/128,368.92
  6. Step 6: Final answer
    x = 99,062.19

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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.