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Finding the Fourth Proportional to 21,009.53, 28,993.05 and 11,578.07

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Solution

The fourth proportional to 21,009.53, 28,993.05 and 11,578.07 is: 15,977.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.53 : 28,993.05 = 11,578.07 : x
  2. Step 2: Convert to fraction form
    21,009.53/28,993.05 = 11,578.07/x
  3. Step 3: Cross multiply
    21,009.53x = 28,993.05 × 11,578.07
  4. Step 4: Simplify right side
    21,009.53x = 335,683,417.45
  5. Step 5: Solve for x
    x = 335,683,417.45/21,009.53
  6. Step 6: Final answer
    x = 15,977.68

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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.