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Finding the Fourth Proportional to 98,139.90, 135,433.71 and 55,699.14

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Solution

The fourth proportional to 98,139.90, 135,433.71 and 55,699.14 is: 76,865.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,139.90 : 135,433.71 = 55,699.14 : x
  2. Step 2: Convert to fraction form
    98,139.90/135,433.71 = 55,699.14/x
  3. Step 3: Cross multiply
    98,139.90x = 135,433.71 × 55,699.14
  4. Step 4: Simplify right side
    98,139.90x = 7,543,541,174.01
  5. Step 5: Solve for x
    x = 7,543,541,174.01/98,139.90
  6. Step 6: Final answer
    x = 76,865.18

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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.