Home / 1,580.07-2,180.57-916.79

Finding the Fourth Proportional to 1,580.07, 2,180.57 and 916.79

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Solution

The fourth proportional to 1,580.07, 2,180.57 and 916.79 is: 1,265.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,580.07 : 2,180.57 = 916.79 : x
  2. Step 2: Convert to fraction form
    1,580.07/2,180.57 = 916.79/x
  3. Step 3: Cross multiply
    1,580.07x = 2,180.57 × 916.79
  4. Step 4: Simplify right side
    1,580.07x = 1,999,114.44
  5. Step 5: Solve for x
    x = 1,999,114.44/1,580.07
  6. Step 6: Final answer
    x = 1,265.20

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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.