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Finding the Fourth Proportional to 1,670.60, 2,507.10 and 939.40

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Solution

The fourth proportional to 1,670.60, 2,507.10 and 939.40 is: 1,409.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,670.60 : 2,507.10 = 939.40 : x
  2. Step 2: Convert to fraction form
    1,670.60/2,507.10 = 939.40/x
  3. Step 3: Cross multiply
    1,670.60x = 2,507.10 × 939.40
  4. Step 4: Simplify right side
    1,670.60x = 2,355,169.74
  5. Step 5: Solve for x
    x = 2,355,169.74/1,670.60
  6. Step 6: Final answer
    x = 1,409.77

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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.