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Finding the Fourth Proportional to 390,171.63, 538,480.61 and 220,416.69

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Solution

The fourth proportional to 390,171.63, 538,480.61 and 220,416.69 is: 304,199.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,171.63 : 538,480.61 = 220,416.69 : x
  2. Step 2: Convert to fraction form
    390,171.63/538,480.61 = 220,416.69/x
  3. Step 3: Cross multiply
    390,171.63x = 538,480.61 × 220,416.69
  4. Step 4: Simplify right side
    390,171.63x = 118,690,109,890.89
  5. Step 5: Solve for x
    x = 118,690,109,890.89/390,171.63
  6. Step 6: Final answer
    x = 304,199.75

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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.