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Finding the Fourth Proportional to 528,726.18, 729,649.71 and 287,009.22

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Solution

The fourth proportional to 528,726.18, 729,649.71 and 287,009.22 is: 396,076.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,726.18 : 729,649.71 = 287,009.22 : x
  2. Step 2: Convert to fraction form
    528,726.18/729,649.71 = 287,009.22/x
  3. Step 3: Cross multiply
    528,726.18x = 729,649.71 × 287,009.22
  4. Step 4: Simplify right side
    528,726.18x = 209,416,194,140.33
  5. Step 5: Solve for x
    x = 209,416,194,140.33/528,726.18
  6. Step 6: Final answer
    x = 396,076.84

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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.