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Finding the Fourth Proportional to 14,009.30, 21,009.90 and 5,123.60

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Solution

The fourth proportional to 14,009.30, 21,009.90 and 5,123.60 is: 7,683.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,009.30 : 21,009.90 = 5,123.60 : x
  2. Step 2: Convert to fraction form
    14,009.30/21,009.90 = 5,123.60/x
  3. Step 3: Cross multiply
    14,009.30x = 21,009.90 × 5,123.60
  4. Step 4: Simplify right side
    14,009.30x = 107,646,323.64
  5. Step 5: Solve for x
    x = 107,646,323.64/14,009.30
  6. Step 6: Final answer
    x = 7,683.92

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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.