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Finding the Fourth Proportional to 19,397.40, 29,063.70 and 12,820.20

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Solution

The fourth proportional to 19,397.40, 29,063.70 and 12,820.20 is: 19,208.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,397.40 : 29,063.70 = 12,820.20 : x
  2. Step 2: Convert to fraction form
    19,397.40/29,063.70 = 12,820.20/x
  3. Step 3: Cross multiply
    19,397.40x = 29,063.70 × 12,820.20
  4. Step 4: Simplify right side
    19,397.40x = 372,602,446.74
  5. Step 5: Solve for x
    x = 372,602,446.74/19,397.40
  6. Step 6: Final answer
    x = 19,208.89

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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.