Home / 128,547.48-177,222.78-90,255.72

Finding the Fourth Proportional to 128,547.48, 177,222.78 and 90,255.72

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Solution

The fourth proportional to 128,547.48, 177,222.78 and 90,255.72 is: 124,431.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,547.48 : 177,222.78 = 90,255.72 : x
  2. Step 2: Convert to fraction form
    128,547.48/177,222.78 = 90,255.72/x
  3. Step 3: Cross multiply
    128,547.48x = 177,222.78 × 90,255.72
  4. Step 4: Simplify right side
    128,547.48x = 15,995,369,609.30
  5. Step 5: Solve for x
    x = 15,995,369,609.30/128,547.48
  6. Step 6: Final answer
    x = 124,431.61

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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.