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Finding the Fourth Proportional to 143,013.51, 197,247.06 and 99,978.81

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Solution

The fourth proportional to 143,013.51, 197,247.06 and 99,978.81 is: 137,892.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,013.51 : 197,247.06 = 99,978.81 : x
  2. Step 2: Convert to fraction form
    143,013.51/197,247.06 = 99,978.81/x
  3. Step 3: Cross multiply
    143,013.51x = 197,247.06 × 99,978.81
  4. Step 4: Simplify right side
    143,013.51x = 19,720,526,334.80
  5. Step 5: Solve for x
    x = 19,720,526,334.80/143,013.51
  6. Step 6: Final answer
    x = 137,892.75

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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.