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Finding the Fourth Proportional to 390,771.78, 539,265.06 and 221,002.26

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Solution

The fourth proportional to 390,771.78, 539,265.06 and 221,002.26 is: 304,983.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,771.78 : 539,265.06 = 221,002.26 : x
  2. Step 2: Convert to fraction form
    390,771.78/539,265.06 = 221,002.26/x
  3. Step 3: Cross multiply
    390,771.78x = 539,265.06 × 221,002.26
  4. Step 4: Simplify right side
    390,771.78x = 119,178,796,999.04
  5. Step 5: Solve for x
    x = 119,178,796,999.04/390,771.78
  6. Step 6: Final answer
    x = 304,983.12

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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.