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Finding the Fourth Proportional to 644,287.91, 889,562.12 and 402,679.08

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Solution

The fourth proportional to 644,287.91, 889,562.12 and 402,679.08 is: 555,975.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,287.91 : 889,562.12 = 402,679.08 : x
  2. Step 2: Convert to fraction form
    644,287.91/889,562.12 = 402,679.08/x
  3. Step 3: Cross multiply
    644,287.91x = 889,562.12 × 402,679.08
  4. Step 4: Simplify right side
    644,287.91x = 358,208,054,071.05
  5. Step 5: Solve for x
    x = 358,208,054,071.05/644,287.91
  6. Step 6: Final answer
    x = 555,975.13

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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.