Home / 1,440.77-1,988.19-811.35

Finding the Fourth Proportional to 1,440.77, 1,988.19 and 811.35

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Solution

The fourth proportional to 1,440.77, 1,988.19 and 811.35 is: 1,119.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.77 : 1,988.19 = 811.35 : x
  2. Step 2: Convert to fraction form
    1,440.77/1,988.19 = 811.35/x
  3. Step 3: Cross multiply
    1,440.77x = 1,988.19 × 811.35
  4. Step 4: Simplify right side
    1,440.77x = 1,613,117.96
  5. Step 5: Solve for x
    x = 1,613,117.96/1,440.77
  6. Step 6: Final answer
    x = 1,119.63

Related Problems

Find fourth proportional to 720.38, 994.10 and 405.68
Half scale
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Double scale
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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.