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Finding the Fourth Proportional to 1,578.93, 2,178.74 and 915.69

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Solution

The fourth proportional to 1,578.93, 2,178.74 and 915.69 is: 1,263.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.93 : 2,178.74 = 915.69 : x
  2. Step 2: Convert to fraction form
    1,578.93/2,178.74 = 915.69/x
  3. Step 3: Cross multiply
    1,578.93x = 2,178.74 × 915.69
  4. Step 4: Simplify right side
    1,578.93x = 1,995,050.43
  5. Step 5: Solve for x
    x = 1,995,050.43/1,578.93
  6. Step 6: Final answer
    x = 1,263.55

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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.