Home / 1,440.74-1,988.16-811.25

Finding the Fourth Proportional to 1,440.74, 1,988.16 and 811.25

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Solution

The fourth proportional to 1,440.74, 1,988.16 and 811.25 is: 1,119.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.74 : 1,988.16 = 811.25 : x
  2. Step 2: Convert to fraction form
    1,440.74/1,988.16 = 811.25/x
  3. Step 3: Cross multiply
    1,440.74x = 1,988.16 × 811.25
  4. Step 4: Simplify right side
    1,440.74x = 1,612,884.86
  5. Step 5: Solve for x
    x = 1,612,884.86/1,440.74
  6. Step 6: Final answer
    x = 1,119.49

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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.