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Finding the Fourth Proportional to 390,287.93, 538,590.35 and 220,518.41

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Solution

The fourth proportional to 390,287.93, 538,590.35 and 220,518.41 is: 304,311.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,287.93 : 538,590.35 = 220,518.41 : x
  2. Step 2: Convert to fraction form
    390,287.93/538,590.35 = 220,518.41/x
  3. Step 3: Cross multiply
    390,287.93x = 538,590.35 × 220,518.41
  4. Step 4: Simplify right side
    390,287.93x = 118,769,086,520.75
  5. Step 5: Solve for x
    x = 118,769,086,520.75/390,287.93
  6. Step 6: Final answer
    x = 304,311.45

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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.