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Finding the Fourth Proportional to 13,708.85, 18,921.33 and 8,920.35

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Solution

The fourth proportional to 13,708.85, 18,921.33 and 8,920.35 is: 12,312.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,708.85 : 18,921.33 = 8,920.35 : x
  2. Step 2: Convert to fraction form
    13,708.85/18,921.33 = 8,920.35/x
  3. Step 3: Cross multiply
    13,708.85x = 18,921.33 × 8,920.35
  4. Step 4: Simplify right side
    13,708.85x = 168,784,886.07
  5. Step 5: Solve for x
    x = 168,784,886.07/13,708.85
  6. Step 6: Final answer
    x = 12,312.12

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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.