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Finding the Fourth Proportional to 644,855.91, 889,625.12 and 402,718.11

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Solution

The fourth proportional to 644,855.91, 889,625.12 and 402,718.11 is: 555,578.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,855.91 : 889,625.12 = 402,718.11 : x
  2. Step 2: Convert to fraction form
    644,855.91/889,625.12 = 402,718.11/x
  3. Step 3: Cross multiply
    644,855.91x = 889,625.12 × 402,718.11
  4. Step 4: Simplify right side
    644,855.91x = 358,268,144,921.33
  5. Step 5: Solve for x
    x = 358,268,144,921.33/644,855.91
  6. Step 6: Final answer
    x = 555,578.60

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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.