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Finding the Fourth Proportional to 85,985.46, 128,106.50 and 81,750.64

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Solution

The fourth proportional to 85,985.46, 128,106.50 and 81,750.64 is: 121,797.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,985.46 : 128,106.50 = 81,750.64 : x
  2. Step 2: Convert to fraction form
    85,985.46/128,106.50 = 81,750.64/x
  3. Step 3: Cross multiply
    85,985.46x = 128,106.50 × 81,750.64
  4. Step 4: Simplify right side
    85,985.46x = 10,472,788,363.16
  5. Step 5: Solve for x
    x = 10,472,788,363.16/85,985.46
  6. Step 6: Final answer
    x = 121,797.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.