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Finding the Fourth Proportional to 143,213, 197,634.05 and 78,686.39

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Solution

The fourth proportional to 143,213, 197,634.05 and 78,686.39 is: 108,587.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,213 : 197,634.05 = 78,686.39 : x
  2. Step 2: Convert to fraction form
    143,213/197,634.05 = 78,686.39/x
  3. Step 3: Cross multiply
    143,213x = 197,634.05 × 78,686.39
  4. Step 4: Simplify right side
    143,213x = 15,551,109,935.58
  5. Step 5: Solve for x
    x = 15,551,109,935.58/143,213
  6. Step 6: Final answer
    x = 108,587.28

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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.