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Finding the Fourth Proportional to 1,720.60, 2,580.90 and 856.60

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Solution

The fourth proportional to 1,720.60, 2,580.90 and 856.60 is: 1,284.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.60 : 2,580.90 = 856.60 : x
  2. Step 2: Convert to fraction form
    1,720.60/2,580.90 = 856.60/x
  3. Step 3: Cross multiply
    1,720.60x = 2,580.90 × 856.60
  4. Step 4: Simplify right side
    1,720.60x = 2,210,798.94
  5. Step 5: Solve for x
    x = 2,210,798.94/1,720.60
  6. Step 6: Final answer
    x = 1,284.90

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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.