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Finding the Fourth Proportional to 644,422.56, 889,303.40 and 357,969.36

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Solution

The fourth proportional to 644,422.56, 889,303.40 and 357,969.36 is: 493,997.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,422.56 : 889,303.40 = 357,969.36 : x
  2. Step 2: Convert to fraction form
    644,422.56/889,303.40 = 357,969.36/x
  3. Step 3: Cross multiply
    644,422.56x = 889,303.40 × 357,969.36
  4. Step 4: Simplify right side
    644,422.56x = 318,343,368,943.82
  5. Step 5: Solve for x
    x = 318,343,368,943.82/644,422.56
  6. Step 6: Final answer
    x = 493,997.87

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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.