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Finding the Fourth Proportional to 85,639.40, 128,459.10 and 82,140.20

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Solution

The fourth proportional to 85,639.40, 128,459.10 and 82,140.20 is: 123,210.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,639.40 : 128,459.10 = 82,140.20 : x
  2. Step 2: Convert to fraction form
    85,639.40/128,459.10 = 82,140.20/x
  3. Step 3: Cross multiply
    85,639.40x = 128,459.10 × 82,140.20
  4. Step 4: Simplify right side
    85,639.40x = 10,551,656,165.82
  5. Step 5: Solve for x
    x = 10,551,656,165.82/85,639.40
  6. Step 6: Final answer
    x = 123,210.30

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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.