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Finding the Fourth Proportional to 809.02, 1,116.40 and 454.95

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Solution

The fourth proportional to 809.02, 1,116.40 and 454.95 is: 627.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.02 : 1,116.40 = 454.95 : x
  2. Step 2: Convert to fraction form
    809.02/1,116.40 = 454.95/x
  3. Step 3: Cross multiply
    809.02x = 1,116.40 × 454.95
  4. Step 4: Simplify right side
    809.02x = 507,906.18
  5. Step 5: Solve for x
    x = 507,906.18/809.02
  6. Step 6: Final answer
    x = 627.80

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1.5x scale

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.