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Finding the Fourth Proportional to 768,195.90, 1,152,808.10 and 318,917.15

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Solution

The fourth proportional to 768,195.90, 1,152,808.10 and 318,917.15 is: 478,589.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    768,195.90 : 1,152,808.10 = 318,917.15 : x
  2. Step 2: Convert to fraction form
    768,195.90/1,152,808.10 = 318,917.15/x
  3. Step 3: Cross multiply
    768,195.90x = 1,152,808.10 × 318,917.15
  4. Step 4: Simplify right side
    768,195.90x = 367,650,271,909.26
  5. Step 5: Solve for x
    x = 367,650,271,909.26/768,195.90
  6. Step 6: Final answer
    x = 478,589.21

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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.