Home / 1,578.18-2,177.89-915.16

Finding the Fourth Proportional to 1,578.18, 2,177.89 and 915.16

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Solution

The fourth proportional to 1,578.18, 2,177.89 and 915.16 is: 1,262.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.18 : 2,177.89 = 915.16 : x
  2. Step 2: Convert to fraction form
    1,578.18/2,177.89 = 915.16/x
  3. Step 3: Cross multiply
    1,578.18x = 2,177.89 × 915.16
  4. Step 4: Simplify right side
    1,578.18x = 1,993,117.81
  5. Step 5: Solve for x
    x = 1,993,117.81/1,578.18
  6. Step 6: Final answer
    x = 1,262.92

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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.