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Finding the Fourth Proportional to 1,021.50, 1,409.67 and 555.76

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Solution

The fourth proportional to 1,021.50, 1,409.67 and 555.76 is: 766.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.50 : 1,409.67 = 555.76 : x
  2. Step 2: Convert to fraction form
    1,021.50/1,409.67 = 555.76/x
  3. Step 3: Cross multiply
    1,021.50x = 1,409.67 × 555.76
  4. Step 4: Simplify right side
    1,021.50x = 783,438.20
  5. Step 5: Solve for x
    x = 783,438.20/1,021.50
  6. Step 6: Final answer
    x = 766.95

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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.