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Finding the Fourth Proportional to 545,309.60, 818,578.80 and 421,200.80

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Solution

The fourth proportional to 545,309.60, 818,578.80 and 421,200.80 is: 632,275.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    545,309.60 : 818,578.80 = 421,200.80 : x
  2. Step 2: Convert to fraction form
    545,309.60/818,578.80 = 421,200.80/x
  3. Step 3: Cross multiply
    545,309.60x = 818,578.80 × 421,200.80
  4. Step 4: Simplify right side
    545,309.60x = 344,786,045,423.04
  5. Step 5: Solve for x
    x = 344,786,045,423.04/545,309.60
  6. Step 6: Final answer
    x = 632,275.77

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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.