Home / 1,389.58-1,915.77-1,152.64

Finding the Fourth Proportional to 1,389.58, 1,915.77 and 1,152.64

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Solution

The fourth proportional to 1,389.58, 1,915.77 and 1,152.64 is: 1,589.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.58 : 1,915.77 = 1,152.64 : x
  2. Step 2: Convert to fraction form
    1,389.58/1,915.77 = 1,152.64/x
  3. Step 3: Cross multiply
    1,389.58x = 1,915.77 × 1,152.64
  4. Step 4: Simplify right side
    1,389.58x = 2,208,193.13
  5. Step 5: Solve for x
    x = 2,208,193.13/1,389.58
  6. Step 6: Final answer
    x = 1,589.11

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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.