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Finding the Fourth Proportional to 644,330.40, 889,147.16 and 386,349.72

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Solution

The fourth proportional to 644,330.40, 889,147.16 and 386,349.72 is: 533,145.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,330.40 : 889,147.16 = 386,349.72 : x
  2. Step 2: Convert to fraction form
    644,330.40/889,147.16 = 386,349.72/x
  3. Step 3: Cross multiply
    644,330.40x = 889,147.16 × 386,349.72
  4. Step 4: Simplify right side
    644,330.40x = 343,521,756,304.80
  5. Step 5: Solve for x
    x = 343,521,756,304.80/644,330.40
  6. Step 6: Final answer
    x = 533,145.35

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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.