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Finding the Fourth Proportional to 12,640.81, 18,977.61 and 9,721.18

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Solution

The fourth proportional to 12,640.81, 18,977.61 and 9,721.18 is: 14,594.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640.81 : 18,977.61 = 9,721.18 : x
  2. Step 2: Convert to fraction form
    12,640.81/18,977.61 = 9,721.18/x
  3. Step 3: Cross multiply
    12,640.81x = 18,977.61 × 9,721.18
  4. Step 4: Simplify right side
    12,640.81x = 184,484,762.78
  5. Step 5: Solve for x
    x = 184,484,762.78/12,640.81
  6. Step 6: Final answer
    x = 14,594.38

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1.5x scale

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.