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Finding the Fourth Proportional to 19,985,444.40, 29,978,166.60 and 7,207,240.80

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Solution

The fourth proportional to 19,985,444.40, 29,978,166.60 and 7,207,240.80 is: 10,810,861.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,985,444.40 : 29,978,166.60 = 7,207,240.80 : x
  2. Step 2: Convert to fraction form
    19,985,444.40/29,978,166.60 = 7,207,240.80/x
  3. Step 3: Cross multiply
    19,985,444.40x = 29,978,166.60 × 7,207,240.80
  4. Step 4: Simplify right side
    19,985,444.40x = 216,059,865,428,717.28
  5. Step 5: Solve for x
    x = 216,059,865,428,717.28/19,985,444.40
  6. Step 6: Final answer
    x = 10,810,861.20

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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.