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Finding the Fourth Proportional to 644,386.24, 889,322.88 and 389,877.76

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Solution

The fourth proportional to 644,386.24, 889,322.88 and 389,877.76 is: 538,073.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,386.24 : 889,322.88 = 389,877.76 : x
  2. Step 2: Convert to fraction form
    644,386.24/889,322.88 = 389,877.76/x
  3. Step 3: Cross multiply
    644,386.24x = 889,322.88 × 389,877.76
  4. Step 4: Simplify right side
    644,386.24x = 346,727,212,371.15
  5. Step 5: Solve for x
    x = 346,727,212,371.15/644,386.24
  6. Step 6: Final answer
    x = 538,073.58

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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.