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Finding the Fourth Proportional to 108,470.76, 149,689.64 and 66,029.28

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Solution

The fourth proportional to 108,470.76, 149,689.64 and 66,029.28 is: 91,120.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,470.76 : 149,689.64 = 66,029.28 : x
  2. Step 2: Convert to fraction form
    108,470.76/149,689.64 = 66,029.28/x
  3. Step 3: Cross multiply
    108,470.76x = 149,689.64 × 66,029.28
  4. Step 4: Simplify right side
    108,470.76x = 9,883,898,822.51
  5. Step 5: Solve for x
    x = 9,883,898,822.51/108,470.76
  6. Step 6: Final answer
    x = 91,120.40

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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.