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Finding the Fourth Proportional to 1,578.88, 2,178.90 and 915.94

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Solution

The fourth proportional to 1,578.88, 2,178.90 and 915.94 is: 1,264.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.88 : 2,178.90 = 915.94 : x
  2. Step 2: Convert to fraction form
    1,578.88/2,178.90 = 915.94/x
  3. Step 3: Cross multiply
    1,578.88x = 2,178.90 × 915.94
  4. Step 4: Simplify right side
    1,578.88x = 1,995,741.67
  5. Step 5: Solve for x
    x = 1,995,741.67/1,578.88
  6. Step 6: Final answer
    x = 1,264.02

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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.