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Finding the Fourth Proportional to 644,378.94, 889,218.18 and 357,917.28

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Solution

The fourth proportional to 644,378.94, 889,218.18 and 357,917.28 is: 493,912.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,378.94 : 889,218.18 = 357,917.28 : x
  2. Step 2: Convert to fraction form
    644,378.94/889,218.18 = 357,917.28/x
  3. Step 3: Cross multiply
    644,378.94x = 889,218.18 × 357,917.28
  4. Step 4: Simplify right side
    644,378.94x = 318,266,552,312.15
  5. Step 5: Solve for x
    x = 318,266,552,312.15/644,378.94
  6. Step 6: Final answer
    x = 493,912.10

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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.