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Finding the Fourth Proportional to 163,312.72, 225,363.93 and 90,720.31

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Solution

The fourth proportional to 163,312.72, 225,363.93 and 90,720.31 is: 125,189.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    163,312.72 : 225,363.93 = 90,720.31 : x
  2. Step 2: Convert to fraction form
    163,312.72/225,363.93 = 90,720.31/x
  3. Step 3: Cross multiply
    163,312.72x = 225,363.93 × 90,720.31
  4. Step 4: Simplify right side
    163,312.72x = 20,445,086,382.63
  5. Step 5: Solve for x
    x = 20,445,086,382.63/163,312.72
  6. Step 6: Final answer
    x = 125,189.80

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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.