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Finding the Fourth Proportional to 1,040.95, 1,436.52 and 621.49

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Solution

The fourth proportional to 1,040.95, 1,436.52 and 621.49 is: 857.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.95 : 1,436.52 = 621.49 : x
  2. Step 2: Convert to fraction form
    1,040.95/1,436.52 = 621.49/x
  3. Step 3: Cross multiply
    1,040.95x = 1,436.52 × 621.49
  4. Step 4: Simplify right side
    1,040.95x = 892,782.81
  5. Step 5: Solve for x
    x = 892,782.81/1,040.95
  6. Step 6: Final answer
    x = 857.66

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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.