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Finding the Fourth Proportional to 2,559.21, 3,838.74 and 915.63

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Solution

The fourth proportional to 2,559.21, 3,838.74 and 915.63 is: 1,373.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,559.21 : 3,838.74 = 915.63 : x
  2. Step 2: Convert to fraction form
    2,559.21/3,838.74 = 915.63/x
  3. Step 3: Cross multiply
    2,559.21x = 3,838.74 × 915.63
  4. Step 4: Simplify right side
    2,559.21x = 3,514,865.51
  5. Step 5: Solve for x
    x = 3,514,865.51/2,559.21
  6. Step 6: Final answer
    x = 1,373.42

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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.