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Finding the Fourth Proportional to 5,280,999.90, 7,921,499.85 and 1,291,911.90

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Solution

The fourth proportional to 5,280,999.90, 7,921,499.85 and 1,291,911.90 is: 1,937,867.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,280,999.90 : 7,921,499.85 = 1,291,911.90 : x
  2. Step 2: Convert to fraction form
    5,280,999.90/7,921,499.85 = 1,291,911.90/x
  3. Step 3: Cross multiply
    5,280,999.90x = 7,921,499.85 × 1,291,911.90
  4. Step 4: Simplify right side
    5,280,999.90x = 10,233,879,922,063.21
  5. Step 5: Solve for x
    x = 10,233,879,922,063.21/5,280,999.90
  6. Step 6: Final answer
    x = 1,937,867.85

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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.