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Finding the Fourth Proportional to 101,211.28, 139,639.08 and 56,490.64

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Solution

The fourth proportional to 101,211.28, 139,639.08 and 56,490.64 is: 77,938.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,211.28 : 139,639.08 = 56,490.64 : x
  2. Step 2: Convert to fraction form
    101,211.28/139,639.08 = 56,490.64/x
  3. Step 3: Cross multiply
    101,211.28x = 139,639.08 × 56,490.64
  4. Step 4: Simplify right side
    101,211.28x = 7,888,300,998.21
  5. Step 5: Solve for x
    x = 7,888,300,998.21/101,211.28
  6. Step 6: Final answer
    x = 77,938.95

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.