Home / 1,221.04-1,685.06-723.67

Finding the Fourth Proportional to 1,221.04, 1,685.06 and 723.67

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Solution

The fourth proportional to 1,221.04, 1,685.06 and 723.67 is: 998.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.04 : 1,685.06 = 723.67 : x
  2. Step 2: Convert to fraction form
    1,221.04/1,685.06 = 723.67/x
  3. Step 3: Cross multiply
    1,221.04x = 1,685.06 × 723.67
  4. Step 4: Simplify right side
    1,221.04x = 1,219,427.37
  5. Step 5: Solve for x
    x = 1,219,427.37/1,221.04
  6. Step 6: Final answer
    x = 998.68

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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.