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Finding the Fourth Proportional to 809.98, 1,117.75 and 455.95

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Solution

The fourth proportional to 809.98, 1,117.75 and 455.95 is: 629.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.98 : 1,117.75 = 455.95 : x
  2. Step 2: Convert to fraction form
    809.98/1,117.75 = 455.95/x
  3. Step 3: Cross multiply
    809.98x = 1,117.75 × 455.95
  4. Step 4: Simplify right side
    809.98x = 509,638.11
  5. Step 5: Solve for x
    x = 509,638.11/809.98
  6. Step 6: Final answer
    x = 629.20

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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.