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Finding the Fourth Proportional to 208,365.21, 287,543.97 and 112,871.88

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Solution

The fourth proportional to 208,365.21, 287,543.97 and 112,871.88 is: 155,763.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,365.21 : 287,543.97 = 112,871.88 : x
  2. Step 2: Convert to fraction form
    208,365.21/287,543.97 = 112,871.88/x
  3. Step 3: Cross multiply
    208,365.21x = 287,543.97 × 112,871.88
  4. Step 4: Simplify right side
    208,365.21x = 32,455,628,476.56
  5. Step 5: Solve for x
    x = 32,455,628,476.56/208,365.21
  6. Step 6: Final answer
    x = 155,763.18

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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.