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Finding the Fourth Proportional to 18,695,998.40, 28,038,748.80 and 5,920,419.20

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Solution

The fourth proportional to 18,695,998.40, 28,038,748.80 and 5,920,419.20 is: 8,878,966.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,695,998.40 : 28,038,748.80 = 5,920,419.20 : x
  2. Step 2: Convert to fraction form
    18,695,998.40/28,038,748.80 = 5,920,419.20/x
  3. Step 3: Cross multiply
    18,695,998.40x = 28,038,748.80 × 5,920,419.20
  4. Step 4: Simplify right side
    18,695,998.40x = 166,001,146,739,496.97
  5. Step 5: Solve for x
    x = 166,001,146,739,496.97/18,695,998.40
  6. Step 6: Final answer
    x = 8,878,966.67

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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.