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Finding the Fourth Proportional to 390,119.63, 538,408.89 and 220,364.69

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Solution

The fourth proportional to 390,119.63, 538,408.89 and 220,364.69 is: 304,128.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,119.63 : 538,408.89 = 220,364.69 : x
  2. Step 2: Convert to fraction form
    390,119.63/538,408.89 = 220,364.69/x
  3. Step 3: Cross multiply
    390,119.63x = 538,408.89 × 220,364.69
  4. Step 4: Simplify right side
    390,119.63x = 118,646,305,446.05
  5. Step 5: Solve for x
    x = 118,646,305,446.05/390,119.63
  6. Step 6: Final answer
    x = 304,128.01

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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.