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Finding the Fourth Proportional to 390,122.38, 538,412.69 and 220,367.44

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Solution

The fourth proportional to 390,122.38, 538,412.69 and 220,367.44 is: 304,131.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,122.38 : 538,412.69 = 220,367.44 : x
  2. Step 2: Convert to fraction form
    390,122.38/538,412.69 = 220,367.44/x
  3. Step 3: Cross multiply
    390,122.38x = 538,412.69 × 220,367.44
  4. Step 4: Simplify right side
    390,122.38x = 118,648,626,158.81
  5. Step 5: Solve for x
    x = 118,648,626,158.81/390,122.38
  6. Step 6: Final answer
    x = 304,131.81

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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.