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Finding the Fourth Proportional to 519,813.60, 779,720.40 and 320,359.20

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Solution

The fourth proportional to 519,813.60, 779,720.40 and 320,359.20 is: 480,538.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,813.60 : 779,720.40 = 320,359.20 : x
  2. Step 2: Convert to fraction form
    519,813.60/779,720.40 = 320,359.20/x
  3. Step 3: Cross multiply
    519,813.60x = 779,720.40 × 320,359.20
  4. Step 4: Simplify right side
    519,813.60x = 249,790,603,567.68
  5. Step 5: Solve for x
    x = 249,790,603,567.68/519,813.60
  6. Step 6: Final answer
    x = 480,538.80

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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.