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Finding the Fourth Proportional to 1,021.78, 1,410 and 556

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Solution

The fourth proportional to 1,021.78, 1,410 and 556 is: 767.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.78 : 1,410 = 556 : x
  2. Step 2: Convert to fraction form
    1,021.78/1,410 = 556/x
  3. Step 3: Cross multiply
    1,021.78x = 1,410 × 556
  4. Step 4: Simplify right side
    1,021.78x = 783,960
  5. Step 5: Solve for x
    x = 783,960/1,021.78
  6. Step 6: Final answer
    x = 767.25

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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.