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Finding the Fourth Proportional to 621,978.09, 858,594.60 and 418,147.23

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Solution

The fourth proportional to 621,978.09, 858,594.60 and 418,147.23 is: 577,221.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,978.09 : 858,594.60 = 418,147.23 : x
  2. Step 2: Convert to fraction form
    621,978.09/858,594.60 = 418,147.23/x
  3. Step 3: Cross multiply
    621,978.09x = 858,594.60 × 418,147.23
  4. Step 4: Simplify right side
    621,978.09x = 359,018,953,682.96
  5. Step 5: Solve for x
    x = 359,018,953,682.96/621,978.09
  6. Step 6: Final answer
    x = 577,221.22

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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.