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Finding the Fourth Proportional to 665,608.26, 918,604 and 393,763.66

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Solution

The fourth proportional to 665,608.26, 918,604 and 393,763.66 is: 543,432.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,608.26 : 918,604 = 393,763.66 : x
  2. Step 2: Convert to fraction form
    665,608.26/918,604 = 393,763.66/x
  3. Step 3: Cross multiply
    665,608.26x = 918,604 × 393,763.66
  4. Step 4: Simplify right side
    665,608.26x = 361,712,873,130.64
  5. Step 5: Solve for x
    x = 361,712,873,130.64/665,608.26
  6. Step 6: Final answer
    x = 543,432.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.