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Finding the Fourth Proportional to 212,739.80, 319,109.70 and 118,261.40

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Solution

The fourth proportional to 212,739.80, 319,109.70 and 118,261.40 is: 177,392.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,739.80 : 319,109.70 = 118,261.40 : x
  2. Step 2: Convert to fraction form
    212,739.80/319,109.70 = 118,261.40/x
  3. Step 3: Cross multiply
    212,739.80x = 319,109.70 × 118,261.40
  4. Step 4: Simplify right side
    212,739.80x = 37,738,359,875.58
  5. Step 5: Solve for x
    x = 37,738,359,875.58/212,739.80
  6. Step 6: Final answer
    x = 177,392.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.