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Finding the Fourth Proportional to 20,978.76, 28,950.78 and 12,026.78

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Solution

The fourth proportional to 20,978.76, 28,950.78 and 12,026.78 is: 16,597.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.76 : 28,950.78 = 12,026.78 : x
  2. Step 2: Convert to fraction form
    20,978.76/28,950.78 = 12,026.78/x
  3. Step 3: Cross multiply
    20,978.76x = 28,950.78 × 12,026.78
  4. Step 4: Simplify right side
    20,978.76x = 348,184,661.89
  5. Step 5: Solve for x
    x = 348,184,661.89/20,978.76
  6. Step 6: Final answer
    x = 16,597.01

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1.5x scale

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.