Home / 1,418.72-1,955.88-1,387.67

Finding the Fourth Proportional to 1,418.72, 1,955.88 and 1,387.67

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Solution

The fourth proportional to 1,418.72, 1,955.88 and 1,387.67 is: 1,913.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.72 : 1,955.88 = 1,387.67 : x
  2. Step 2: Convert to fraction form
    1,418.72/1,955.88 = 1,387.67/x
  3. Step 3: Cross multiply
    1,418.72x = 1,955.88 × 1,387.67
  4. Step 4: Simplify right side
    1,418.72x = 2,714,106.22
  5. Step 5: Solve for x
    x = 2,714,106.22/1,418.72
  6. Step 6: Final answer
    x = 1,913.07

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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.