Home / 1,276.80-1,762.38-981.72

Finding the Fourth Proportional to 1,276.80, 1,762.38 and 981.72

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Solution

The fourth proportional to 1,276.80, 1,762.38 and 981.72 is: 1,355.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.80 : 1,762.38 = 981.72 : x
  2. Step 2: Convert to fraction form
    1,276.80/1,762.38 = 981.72/x
  3. Step 3: Cross multiply
    1,276.80x = 1,762.38 × 981.72
  4. Step 4: Simplify right side
    1,276.80x = 1,730,163.69
  5. Step 5: Solve for x
    x = 1,730,163.69/1,276.80
  6. Step 6: Final answer
    x = 1,355.08

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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.