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Finding the Fourth Proportional to 1,021.85, 1,410.14 and 556.10

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Solution

The fourth proportional to 1,021.85, 1,410.14 and 556.10 is: 767.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.85 : 1,410.14 = 556.10 : x
  2. Step 2: Convert to fraction form
    1,021.85/1,410.14 = 556.10/x
  3. Step 3: Cross multiply
    1,021.85x = 1,410.14 × 556.10
  4. Step 4: Simplify right side
    1,021.85x = 784,178.85
  5. Step 5: Solve for x
    x = 784,178.85/1,021.85
  6. Step 6: Final answer
    x = 767.41

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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.