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Finding the Fourth Proportional to 390,186.88, 538,460.48 and 211,338.88

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Solution

The fourth proportional to 390,186.88, 538,460.48 and 211,338.88 is: 291,649.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,186.88 : 538,460.48 = 211,338.88 : x
  2. Step 2: Convert to fraction form
    390,186.88/538,460.48 = 211,338.88/x
  3. Step 3: Cross multiply
    390,186.88x = 538,460.48 × 211,338.88
  4. Step 4: Simplify right side
    390,186.88x = 113,797,634,767.46
  5. Step 5: Solve for x
    x = 113,797,634,767.46/390,186.88
  6. Step 6: Final answer
    x = 291,649.05

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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.