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Finding the Fourth Proportional to 390,431.22, 538,791.30 and 218,347.26

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Solution

The fourth proportional to 390,431.22, 538,791.30 and 218,347.26 is: 301,317.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,431.22 : 538,791.30 = 218,347.26 : x
  2. Step 2: Convert to fraction form
    390,431.22/538,791.30 = 218,347.26/x
  3. Step 3: Cross multiply
    390,431.22x = 538,791.30 × 218,347.26
  4. Step 4: Simplify right side
    390,431.22x = 117,643,604,066.84
  5. Step 5: Solve for x
    x = 117,643,604,066.84/390,431.22
  6. Step 6: Final answer
    x = 301,317.10

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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.