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Finding the Fourth Proportional to 20,710.85, 28,564.07 and 12,738.77

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Solution

The fourth proportional to 20,710.85, 28,564.07 and 12,738.77 is: 17,569.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,710.85 : 28,564.07 = 12,738.77 : x
  2. Step 2: Convert to fraction form
    20,710.85/28,564.07 = 12,738.77/x
  3. Step 3: Cross multiply
    20,710.85x = 28,564.07 × 12,738.77
  4. Step 4: Simplify right side
    20,710.85x = 363,871,007.02
  5. Step 5: Solve for x
    x = 363,871,007.02/20,710.85
  6. Step 6: Final answer
    x = 17,569.10

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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.