Home / 1,313.10-1,811.43-1,118.70

Finding the Fourth Proportional to 1,313.10, 1,811.43 and 1,118.70

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Solution

The fourth proportional to 1,313.10, 1,811.43 and 1,118.70 is: 1,543.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.10 : 1,811.43 = 1,118.70 : x
  2. Step 2: Convert to fraction form
    1,313.10/1,811.43 = 1,118.70/x
  3. Step 3: Cross multiply
    1,313.10x = 1,811.43 × 1,118.70
  4. Step 4: Simplify right side
    1,313.10x = 2,026,446.74
  5. Step 5: Solve for x
    x = 2,026,446.74/1,313.10
  6. Step 6: Final answer
    x = 1,543.25

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1.5x scale

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.