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Finding the Fourth Proportional to 98,128.40, 135,417.84 and 55,687.64

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Solution

The fourth proportional to 98,128.40, 135,417.84 and 55,687.64 is: 76,849.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,128.40 : 135,417.84 = 55,687.64 : x
  2. Step 2: Convert to fraction form
    98,128.40/135,417.84 = 55,687.64/x
  3. Step 3: Cross multiply
    98,128.40x = 135,417.84 × 55,687.64
  4. Step 4: Simplify right side
    98,128.40x = 7,541,099,923.50
  5. Step 5: Solve for x
    x = 7,541,099,923.50/98,128.40
  6. Step 6: Final answer
    x = 76,849.31

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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.