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Finding the Fourth Proportional to 644,393.13, 889,262.58 and 357,939.87

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Solution

The fourth proportional to 644,393.13, 889,262.58 and 357,939.87 is: 493,957.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,393.13 : 889,262.58 = 357,939.87 : x
  2. Step 2: Convert to fraction form
    644,393.13/889,262.58 = 357,939.87/x
  3. Step 3: Cross multiply
    644,393.13x = 889,262.58 × 357,939.87
  4. Step 4: Simplify right side
    644,393.13x = 318,302,532,281.07
  5. Step 5: Solve for x
    x = 318,302,532,281.07/644,393.13
  6. Step 6: Final answer
    x = 493,957.05

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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.