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Finding the Fourth Proportional to 2,118.32, 3,177.80 and 657.60

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Solution

The fourth proportional to 2,118.32, 3,177.80 and 657.60 is: 986.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118.32 : 3,177.80 = 657.60 : x
  2. Step 2: Convert to fraction form
    2,118.32/3,177.80 = 657.60/x
  3. Step 3: Cross multiply
    2,118.32x = 3,177.80 × 657.60
  4. Step 4: Simplify right side
    2,118.32x = 2,089,721.28
  5. Step 5: Solve for x
    x = 2,089,721.28/2,118.32
  6. Step 6: Final answer
    x = 986.50

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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.