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Finding the Fourth Proportional to 18,981.21, 28,471.77 and 5,130.21

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Solution

The fourth proportional to 18,981.21, 28,471.77 and 5,130.21 is: 7,695.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,981.21 : 28,471.77 = 5,130.21 : x
  2. Step 2: Convert to fraction form
    18,981.21/28,471.77 = 5,130.21/x
  3. Step 3: Cross multiply
    18,981.21x = 28,471.77 × 5,130.21
  4. Step 4: Simplify right side
    18,981.21x = 146,066,159.17
  5. Step 5: Solve for x
    x = 146,066,159.17/18,981.21
  6. Step 6: Final answer
    x = 7,695.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.