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Finding the Fourth Proportional to 25,613.40, 38,420.10 and 21,239.40

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Solution

The fourth proportional to 25,613.40, 38,420.10 and 21,239.40 is: 31,859.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,613.40 : 38,420.10 = 21,239.40 : x
  2. Step 2: Convert to fraction form
    25,613.40/38,420.10 = 21,239.40/x
  3. Step 3: Cross multiply
    25,613.40x = 38,420.10 × 21,239.40
  4. Step 4: Simplify right side
    25,613.40x = 816,019,871.94
  5. Step 5: Solve for x
    x = 816,019,871.94/25,613.40
  6. Step 6: Final answer
    x = 31,859.10

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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.