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Finding the Fourth Proportional to 577,847.80, 865,896.90 and 390,640.60

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Solution

The fourth proportional to 577,847.80, 865,896.90 and 390,640.60 is: 585,369.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    577,847.80 : 865,896.90 = 390,640.60 : x
  2. Step 2: Convert to fraction form
    577,847.80/865,896.90 = 390,640.60/x
  3. Step 3: Cross multiply
    577,847.80x = 865,896.90 × 390,640.60
  4. Step 4: Simplify right side
    577,847.80x = 338,254,484,554.14
  5. Step 5: Solve for x
    x = 338,254,484,554.14/577,847.80
  6. Step 6: Final answer
    x = 585,369.51

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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.