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Finding the Fourth Proportional to 640,810.80, 961,216.20 and 557,866.80

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Solution

The fourth proportional to 640,810.80, 961,216.20 and 557,866.80 is: 836,800.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,810.80 : 961,216.20 = 557,866.80 : x
  2. Step 2: Convert to fraction form
    640,810.80/961,216.20 = 557,866.80/x
  3. Step 3: Cross multiply
    640,810.80x = 961,216.20 × 557,866.80
  4. Step 4: Simplify right side
    640,810.80x = 536,230,605,602.16
  5. Step 5: Solve for x
    x = 536,230,605,602.16/640,810.80
  6. Step 6: Final answer
    x = 836,800.20

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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.