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Finding the Fourth Proportional to 100,804.28, 139,051.96 and 63,012.92

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Solution

The fourth proportional to 100,804.28, 139,051.96 and 63,012.92 is: 86,921.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,804.28 : 139,051.96 = 63,012.92 : x
  2. Step 2: Convert to fraction form
    100,804.28/139,051.96 = 63,012.92/x
  3. Step 3: Cross multiply
    100,804.28x = 139,051.96 × 63,012.92
  4. Step 4: Simplify right side
    100,804.28x = 8,762,069,178.53
  5. Step 5: Solve for x
    x = 8,762,069,178.53/100,804.28
  6. Step 6: Final answer
    x = 86,921.60

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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.