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Finding the Fourth Proportional to 25,355.40, 38,000.70 and 18,421.80

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Solution

The fourth proportional to 25,355.40, 38,000.70 and 18,421.80 is: 27,609.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,355.40 : 38,000.70 = 18,421.80 : x
  2. Step 2: Convert to fraction form
    25,355.40/38,000.70 = 18,421.80/x
  3. Step 3: Cross multiply
    25,355.40x = 38,000.70 × 18,421.80
  4. Step 4: Simplify right side
    25,355.40x = 700,041,295.26
  5. Step 5: Solve for x
    x = 700,041,295.26/25,355.40
  6. Step 6: Final answer
    x = 27,609.16

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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.