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Finding the Fourth Proportional to 218,397.31, 301,390.43 and 121,602.51

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Solution

The fourth proportional to 218,397.31, 301,390.43 and 121,602.51 is: 167,812.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,397.31 : 301,390.43 = 121,602.51 : x
  2. Step 2: Convert to fraction form
    218,397.31/301,390.43 = 121,602.51/x
  3. Step 3: Cross multiply
    218,397.31x = 301,390.43 × 121,602.51
  4. Step 4: Simplify right side
    218,397.31x = 36,649,832,777.98
  5. Step 5: Solve for x
    x = 36,649,832,777.98/218,397.31
  6. Step 6: Final answer
    x = 167,812.66

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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.