Home / 1,580.36-2,181.35-917.51

Finding the Fourth Proportional to 1,580.36, 2,181.35 and 917.51

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Solution

The fourth proportional to 1,580.36, 2,181.35 and 917.51 is: 1,266.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,580.36 : 2,181.35 = 917.51 : x
  2. Step 2: Convert to fraction form
    1,580.36/2,181.35 = 917.51/x
  3. Step 3: Cross multiply
    1,580.36x = 2,181.35 × 917.51
  4. Step 4: Simplify right side
    1,580.36x = 2,001,401.83
  5. Step 5: Solve for x
    x = 2,001,401.83/1,580.36
  6. Step 6: Final answer
    x = 1,266.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.