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Finding the Fourth Proportional to 14,159.70, 21,172.08 and 12,920.40

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Solution

The fourth proportional to 14,159.70, 21,172.08 and 12,920.40 is: 19,319.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,159.70 : 21,172.08 = 12,920.40 : x
  2. Step 2: Convert to fraction form
    14,159.70/21,172.08 = 12,920.40/x
  3. Step 3: Cross multiply
    14,159.70x = 21,172.08 × 12,920.40
  4. Step 4: Simplify right side
    14,159.70x = 273,551,742.43
  5. Step 5: Solve for x
    x = 273,551,742.43/14,159.70
  6. Step 6: Final answer
    x = 19,319.04

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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.