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Finding the Fourth Proportional to 644,168.64, 889,034.72 and 389,521.64

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Solution

The fourth proportional to 644,168.64, 889,034.72 and 389,521.64 is: 537,589.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,168.64 : 889,034.72 = 389,521.64 : x
  2. Step 2: Convert to fraction form
    644,168.64/889,034.72 = 389,521.64/x
  3. Step 3: Cross multiply
    644,168.64x = 889,034.72 × 389,521.64
  4. Step 4: Simplify right side
    644,168.64x = 346,298,262,151.34
  5. Step 5: Solve for x
    x = 346,298,262,151.34/644,168.64
  6. Step 6: Final answer
    x = 537,589.45

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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.