Home / 1,277.40-1,762.38-811.92

Finding the Fourth Proportional to 1,277.40, 1,762.38 and 811.92

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Solution

The fourth proportional to 1,277.40, 1,762.38 and 811.92 is: 1,120.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.40 : 1,762.38 = 811.92 : x
  2. Step 2: Convert to fraction form
    1,277.40/1,762.38 = 811.92/x
  3. Step 3: Cross multiply
    1,277.40x = 1,762.38 × 811.92
  4. Step 4: Simplify right side
    1,277.40x = 1,430,911.57
  5. Step 5: Solve for x
    x = 1,430,911.57/1,277.40
  6. Step 6: Final answer
    x = 1,120.18

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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.