Home / 1,276.30-1,762.14-981.04

Finding the Fourth Proportional to 1,276.30, 1,762.14 and 981.04

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Solution

The fourth proportional to 1,276.30, 1,762.14 and 981.04 is: 1,354.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.30 : 1,762.14 = 981.04 : x
  2. Step 2: Convert to fraction form
    1,276.30/1,762.14 = 981.04/x
  3. Step 3: Cross multiply
    1,276.30x = 1,762.14 × 981.04
  4. Step 4: Simplify right side
    1,276.30x = 1,728,729.83
  5. Step 5: Solve for x
    x = 1,728,729.83/1,276.30
  6. Step 6: Final answer
    x = 1,354.49

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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.