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Finding the Fourth Proportional to 85,971.88, 128,916.34 and 36,038.58

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Solution

The fourth proportional to 85,971.88, 128,916.34 and 36,038.58 is: 54,040.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,971.88 : 128,916.34 = 36,038.58 : x
  2. Step 2: Convert to fraction form
    85,971.88/128,916.34 = 36,038.58/x
  3. Step 3: Cross multiply
    85,971.88x = 128,916.34 × 36,038.58
  4. Step 4: Simplify right side
    85,971.88x = 4,645,961,832.40
  5. Step 5: Solve for x
    x = 4,645,961,832.40/85,971.88
  6. Step 6: Final answer
    x = 54,040.48

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1.5x scale

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.