Home / 1,461.76-2,190.21-638.80

Finding the Fourth Proportional to 1,461.76, 2,190.21 and 638.80

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Solution

The fourth proportional to 1,461.76, 2,190.21 and 638.80 is: 957.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,461.76 : 2,190.21 = 638.80 : x
  2. Step 2: Convert to fraction form
    1,461.76/2,190.21 = 638.80/x
  3. Step 3: Cross multiply
    1,461.76x = 2,190.21 × 638.80
  4. Step 4: Simplify right side
    1,461.76x = 1,399,106.15
  5. Step 5: Solve for x
    x = 1,399,106.15/1,461.76
  6. Step 6: Final answer
    x = 957.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.