Home / 1,328.88-1,991.60-917.36

Finding the Fourth Proportional to 1,328.88, 1,991.60 and 917.36

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Solution

The fourth proportional to 1,328.88, 1,991.60 and 917.36 is: 1,374.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.88 : 1,991.60 = 917.36 : x
  2. Step 2: Convert to fraction form
    1,328.88/1,991.60 = 917.36/x
  3. Step 3: Cross multiply
    1,328.88x = 1,991.60 × 917.36
  4. Step 4: Simplify right side
    1,328.88x = 1,827,014.18
  5. Step 5: Solve for x
    x = 1,827,014.18/1,328.88
  6. Step 6: Final answer
    x = 1,374.85

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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.