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Finding the Fourth Proportional to 19,611.20, 29,416.80 and 13,390.40

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Solution

The fourth proportional to 19,611.20, 29,416.80 and 13,390.40 is: 20,085.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,611.20 : 29,416.80 = 13,390.40 : x
  2. Step 2: Convert to fraction form
    19,611.20/29,416.80 = 13,390.40/x
  3. Step 3: Cross multiply
    19,611.20x = 29,416.80 × 13,390.40
  4. Step 4: Simplify right side
    19,611.20x = 393,902,718.72
  5. Step 5: Solve for x
    x = 393,902,718.72/19,611.20
  6. Step 6: Final answer
    x = 20,085.60

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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.