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Finding the Fourth Proportional to 5,280,963.90, 7,921,445.85 and 1,291,875.90

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Solution

The fourth proportional to 5,280,963.90, 7,921,445.85 and 1,291,875.90 is: 1,937,813.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,280,963.90 : 7,921,445.85 = 1,291,875.90 : x
  2. Step 2: Convert to fraction form
    5,280,963.90/7,921,445.85 = 1,291,875.90/x
  3. Step 3: Cross multiply
    5,280,963.90x = 7,921,445.85 × 1,291,875.90
  4. Step 4: Simplify right side
    5,280,963.90x = 10,233,524,986,770.01
  5. Step 5: Solve for x
    x = 10,233,524,986,770.01/5,280,963.90
  6. Step 6: Final answer
    x = 1,937,813.85

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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.