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Finding the Fourth Proportional to 127,916.80, 191,702.40 and 85,676.80

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Solution

The fourth proportional to 127,916.80, 191,702.40 and 85,676.80 is: 128,399.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,916.80 : 191,702.40 = 85,676.80 : x
  2. Step 2: Convert to fraction form
    127,916.80/191,702.40 = 85,676.80/x
  3. Step 3: Cross multiply
    127,916.80x = 191,702.40 × 85,676.80
  4. Step 4: Simplify right side
    127,916.80x = 16,424,448,184.32
  5. Step 5: Solve for x
    x = 16,424,448,184.32/127,916.80
  6. Step 6: Final answer
    x = 128,399.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.