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Finding the Fourth Proportional to 390,843.88, 539,364.54 and 211,995.88

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Solution

The fourth proportional to 390,843.88, 539,364.54 and 211,995.88 is: 292,554.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,843.88 : 539,364.54 = 211,995.88 : x
  2. Step 2: Convert to fraction form
    390,843.88/539,364.54 = 211,995.88/x
  3. Step 3: Cross multiply
    390,843.88x = 539,364.54 × 211,995.88
  4. Step 4: Simplify right side
    390,843.88x = 114,343,060,298.10
  5. Step 5: Solve for x
    x = 114,343,060,298.10/390,843.88
  6. Step 6: Final answer
    x = 292,554.31

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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.