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Finding the Fourth Proportional to 528,726.72, 729,643.79 and 287,009.45

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Solution

The fourth proportional to 528,726.72, 729,643.79 and 287,009.45 is: 396,073.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,726.72 : 729,643.79 = 287,009.45 : x
  2. Step 2: Convert to fraction form
    528,726.72/729,643.79 = 287,009.45/x
  3. Step 3: Cross multiply
    528,726.72x = 729,643.79 × 287,009.45
  4. Step 4: Simplify right side
    528,726.72x = 209,414,664,493.39
  5. Step 5: Solve for x
    x = 209,414,664,493.39/528,726.72
  6. Step 6: Final answer
    x = 396,073.55

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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.