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Finding the Fourth Proportional to 85,359.40, 128,039.10 and 80,985.40

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Solution

The fourth proportional to 85,359.40, 128,039.10 and 80,985.40 is: 121,478.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,359.40 : 128,039.10 = 80,985.40 : x
  2. Step 2: Convert to fraction form
    85,359.40/128,039.10 = 80,985.40/x
  3. Step 3: Cross multiply
    85,359.40x = 128,039.10 × 80,985.40
  4. Step 4: Simplify right side
    85,359.40x = 10,369,297,729.14
  5. Step 5: Solve for x
    x = 10,369,297,729.14/85,359.40
  6. Step 6: Final answer
    x = 121,478.10

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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.