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Finding the Fourth Proportional to 390,360.58, 538,698.58 and 218,284.79

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Solution

The fourth proportional to 390,360.58, 538,698.58 and 218,284.79 is: 301,233.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,360.58 : 538,698.58 = 218,284.79 : x
  2. Step 2: Convert to fraction form
    390,360.58/538,698.58 = 218,284.79/x
  3. Step 3: Cross multiply
    390,360.58x = 538,698.58 × 218,284.79
  4. Step 4: Simplify right side
    390,360.58x = 117,589,706,408.60
  5. Step 5: Solve for x
    x = 117,589,706,408.60/390,360.58
  6. Step 6: Final answer
    x = 301,233.56

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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.