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Finding the Fourth Proportional to 644,696.36, 889,310.34 and 402,558.56

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Solution

The fourth proportional to 644,696.36, 889,310.34 and 402,558.56 is: 555,299.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,696.36 : 889,310.34 = 402,558.56 : x
  2. Step 2: Convert to fraction form
    644,696.36/889,310.34 = 402,558.56/x
  3. Step 3: Cross multiply
    644,696.36x = 889,310.34 × 402,558.56
  4. Step 4: Simplify right side
    644,696.36x = 357,999,489,863.51
  5. Step 5: Solve for x
    x = 357,999,489,863.51/644,696.36
  6. Step 6: Final answer
    x = 555,299.38

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1.5x scale

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.