Home / 1,112.40-1,666.60-649.80

Finding the Fourth Proportional to 1,112.40, 1,666.60 and 649.80

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Solution

The fourth proportional to 1,112.40, 1,666.60 and 649.80 is: 973.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.40 : 1,666.60 = 649.80 : x
  2. Step 2: Convert to fraction form
    1,112.40/1,666.60 = 649.80/x
  3. Step 3: Cross multiply
    1,112.40x = 1,666.60 × 649.80
  4. Step 4: Simplify right side
    1,112.40x = 1,082,956.68
  5. Step 5: Solve for x
    x = 1,082,956.68/1,112.40
  6. Step 6: Final answer
    x = 973.53

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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.