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Finding the Fourth Proportional to 644,674.40, 889,375.11 and 402,792.20

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Solution

The fourth proportional to 644,674.40, 889,375.11 and 402,792.20 is: 555,681.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,674.40 : 889,375.11 = 402,792.20 : x
  2. Step 2: Convert to fraction form
    644,674.40/889,375.11 = 402,792.20/x
  3. Step 3: Cross multiply
    644,674.40x = 889,375.11 × 402,792.20
  4. Step 4: Simplify right side
    644,674.40x = 358,233,357,182.14
  5. Step 5: Solve for x
    x = 358,233,357,182.14/644,674.40
  6. Step 6: Final answer
    x = 555,681.07

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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.