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Finding the Fourth Proportional to 14,806.40, 20,407.36 and 13,398.40

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Solution

The fourth proportional to 14,806.40, 20,407.36 and 13,398.40 is: 18,466.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,806.40 : 20,407.36 = 13,398.40 : x
  2. Step 2: Convert to fraction form
    14,806.40/20,407.36 = 13,398.40/x
  3. Step 3: Cross multiply
    14,806.40x = 20,407.36 × 13,398.40
  4. Step 4: Simplify right side
    14,806.40x = 273,425,972.22
  5. Step 5: Solve for x
    x = 273,425,972.22/14,806.40
  6. Step 6: Final answer
    x = 18,466.74

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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.