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Finding the Fourth Proportional to 547,779.20, 821,668.80 and 387,420.80

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Solution

The fourth proportional to 547,779.20, 821,668.80 and 387,420.80 is: 581,131.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    547,779.20 : 821,668.80 = 387,420.80 : x
  2. Step 2: Convert to fraction form
    547,779.20/821,668.80 = 387,420.80/x
  3. Step 3: Cross multiply
    547,779.20x = 821,668.80 × 387,420.80
  4. Step 4: Simplify right side
    547,779.20x = 318,331,583,831.04
  5. Step 5: Solve for x
    x = 318,331,583,831.04/547,779.20
  6. Step 6: Final answer
    x = 581,131.20

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Similar ratio
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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.