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Finding the Fourth Proportional to 640,860.60, 961,290.90 and 535,884.60

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Solution

The fourth proportional to 640,860.60, 961,290.90 and 535,884.60 is: 803,826.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,860.60 : 961,290.90 = 535,884.60 : x
  2. Step 2: Convert to fraction form
    640,860.60/961,290.90 = 535,884.60/x
  3. Step 3: Cross multiply
    640,860.60x = 961,290.90 × 535,884.60
  4. Step 4: Simplify right side
    640,860.60x = 515,140,989,430.14
  5. Step 5: Solve for x
    x = 515,140,989,430.14/640,860.60
  6. Step 6: Final answer
    x = 803,826.90

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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.