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Finding the Fourth Proportional to 390,661, 539,112.18 and 211,813

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Solution

The fourth proportional to 390,661, 539,112.18 and 211,813 is: 292,301.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,661 : 539,112.18 = 211,813 : x
  2. Step 2: Convert to fraction form
    390,661/539,112.18 = 211,813/x
  3. Step 3: Cross multiply
    390,661x = 539,112.18 × 211,813
  4. Step 4: Simplify right side
    390,661x = 114,190,968,182.34
  5. Step 5: Solve for x
    x = 114,190,968,182.34/390,661
  6. Step 6: Final answer
    x = 292,301.94

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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.