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Finding the Fourth Proportional to 128,510.56, 177,514 and 98,664.64

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Solution

The fourth proportional to 128,510.56, 177,514 and 98,664.64 is: 136,287.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,510.56 : 177,514 = 98,664.64 : x
  2. Step 2: Convert to fraction form
    128,510.56/177,514 = 98,664.64/x
  3. Step 3: Cross multiply
    128,510.56x = 177,514 × 98,664.64
  4. Step 4: Simplify right side
    128,510.56x = 17,514,354,904.96
  5. Step 5: Solve for x
    x = 17,514,354,904.96/128,510.56
  6. Step 6: Final answer
    x = 136,287.28

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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.