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Finding the Fourth Proportional to 85,970.43, 128,938.55 and 43,264.46

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Solution

The fourth proportional to 85,970.43, 128,938.55 and 43,264.46 is: 64,888.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,970.43 : 128,938.55 = 43,264.46 : x
  2. Step 2: Convert to fraction form
    85,970.43/128,938.55 = 43,264.46/x
  3. Step 3: Cross multiply
    85,970.43x = 128,938.55 × 43,264.46
  4. Step 4: Simplify right side
    85,970.43x = 5,578,456,844.96
  5. Step 5: Solve for x
    x = 5,578,456,844.96/85,970.43
  6. Step 6: Final answer
    x = 64,888.09

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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.