Home / 1,578.09-2,177.90-915.18

Finding the Fourth Proportional to 1,578.09, 2,177.90 and 915.18

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Solution

The fourth proportional to 1,578.09, 2,177.90 and 915.18 is: 1,263.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.09 : 2,177.90 = 915.18 : x
  2. Step 2: Convert to fraction form
    1,578.09/2,177.90 = 915.18/x
  3. Step 3: Cross multiply
    1,578.09x = 2,177.90 × 915.18
  4. Step 4: Simplify right side
    1,578.09x = 1,993,170.52
  5. Step 5: Solve for x
    x = 1,993,170.52/1,578.09
  6. Step 6: Final answer
    x = 1,263.03

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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.