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Finding the Fourth Proportional to 1,278.09, 1,915.50 and 693.09

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Solution

The fourth proportional to 1,278.09, 1,915.50 and 693.09 is: 1,038.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.09 : 1,915.50 = 693.09 : x
  2. Step 2: Convert to fraction form
    1,278.09/1,915.50 = 693.09/x
  3. Step 3: Cross multiply
    1,278.09x = 1,915.50 × 693.09
  4. Step 4: Simplify right side
    1,278.09x = 1,327,613.90
  5. Step 5: Solve for x
    x = 1,327,613.90/1,278.09
  6. Step 6: Final answer
    x = 1,038.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.