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Finding the Fourth Proportional to 21,992,989.60, 32,989,484.40 and 18,969,680.80

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Solution

The fourth proportional to 21,992,989.60, 32,989,484.40 and 18,969,680.80 is: 28,454,521.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,992,989.60 : 32,989,484.40 = 18,969,680.80 : x
  2. Step 2: Convert to fraction form
    21,992,989.60/32,989,484.40 = 18,969,680.80/x
  3. Step 3: Cross multiply
    21,992,989.60x = 32,989,484.40 × 18,969,680.80
  4. Step 4: Simplify right side
    21,992,989.60x = 625,799,988,824,579.50
  5. Step 5: Solve for x
    x = 625,799,988,824,579.50/21,992,989.60
  6. Step 6: Final answer
    x = 28,454,521.20

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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.