Home / 390,278.18-538,611.12-218,229.66

Finding the Fourth Proportional to 390,278.18, 538,611.12 and 218,229.66

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Solution

The fourth proportional to 390,278.18, 538,611.12 and 218,229.66 is: 301,172.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,278.18 : 538,611.12 = 218,229.66 : x
  2. Step 2: Convert to fraction form
    390,278.18/538,611.12 = 218,229.66/x
  3. Step 3: Cross multiply
    390,278.18x = 538,611.12 × 218,229.66
  4. Step 4: Simplify right side
    390,278.18x = 117,540,921,589.82
  5. Step 5: Solve for x
    x = 117,540,921,589.82/390,278.18
  6. Step 6: Final answer
    x = 301,172.16

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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.