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Finding the Fourth Proportional to 644,703.35, 889,654.40 and 386,451.07

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Solution

The fourth proportional to 644,703.35, 889,654.40 and 386,451.07 is: 533,280.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,703.35 : 889,654.40 = 386,451.07 : x
  2. Step 2: Convert to fraction form
    644,703.35/889,654.40 = 386,451.07/x
  3. Step 3: Cross multiply
    644,703.35x = 889,654.40 × 386,451.07
  4. Step 4: Simplify right side
    644,703.35x = 343,807,894,810.21
  5. Step 5: Solve for x
    x = 343,807,894,810.21/644,703.35
  6. Step 6: Final answer
    x = 533,280.76

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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.