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Finding the Fourth Proportional to 644,663.61, 889,641.05 and 403,086.21

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Solution

The fourth proportional to 644,663.61, 889,641.05 and 403,086.21 is: 556,262.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,663.61 : 889,641.05 = 403,086.21 : x
  2. Step 2: Convert to fraction form
    644,663.61/889,641.05 = 403,086.21/x
  3. Step 3: Cross multiply
    644,663.61x = 889,641.05 × 403,086.21
  4. Step 4: Simplify right side
    644,663.61x = 358,602,037,089.49
  5. Step 5: Solve for x
    x = 358,602,037,089.49/644,663.61
  6. Step 6: Final answer
    x = 556,262.26

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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.