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Finding the Fourth Proportional to 646,685.32, 892,383.01 and 388,408.79

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Solution

The fourth proportional to 646,685.32, 892,383.01 and 388,408.79 is: 535,978.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    646,685.32 : 892,383.01 = 388,408.79 : x
  2. Step 2: Convert to fraction form
    646,685.32/892,383.01 = 388,408.79/x
  3. Step 3: Cross multiply
    646,685.32x = 892,383.01 × 388,408.79
  4. Step 4: Simplify right side
    646,685.32x = 346,609,405,471.71
  5. Step 5: Solve for x
    x = 346,609,405,471.71/646,685.32
  6. Step 6: Final answer
    x = 535,978.47

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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.