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Finding the Fourth Proportional to 21,328.59, 29,423.90 and 12,370.88

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Solution

The fourth proportional to 21,328.59, 29,423.90 and 12,370.88 is: 17,066.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,328.59 : 29,423.90 = 12,370.88 : x
  2. Step 2: Convert to fraction form
    21,328.59/29,423.90 = 12,370.88/x
  3. Step 3: Cross multiply
    21,328.59x = 29,423.90 × 12,370.88
  4. Step 4: Simplify right side
    21,328.59x = 363,999,536.03
  5. Step 5: Solve for x
    x = 363,999,536.03/21,328.59
  6. Step 6: Final answer
    x = 17,066.27

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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.