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Finding the Fourth Proportional to 545,813.70, 818,720.55 and 521,319.30

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Solution

The fourth proportional to 545,813.70, 818,720.55 and 521,319.30 is: 781,978.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    545,813.70 : 818,720.55 = 521,319.30 : x
  2. Step 2: Convert to fraction form
    545,813.70/818,720.55 = 521,319.30/x
  3. Step 3: Cross multiply
    545,813.70x = 818,720.55 × 521,319.30
  4. Step 4: Simplify right side
    545,813.70x = 426,814,824,021.62
  5. Step 5: Solve for x
    x = 426,814,824,021.62/545,813.70
  6. Step 6: Final answer
    x = 781,978.95

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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.