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Finding the Fourth Proportional to 807.46, 1,113.60 and 621.40

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Solution

The fourth proportional to 807.46, 1,113.60 and 621.40 is: 857.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.46 : 1,113.60 = 621.40 : x
  2. Step 2: Convert to fraction form
    807.46/1,113.60 = 621.40/x
  3. Step 3: Cross multiply
    807.46x = 1,113.60 × 621.40
  4. Step 4: Simplify right side
    807.46x = 691,991.04
  5. Step 5: Solve for x
    x = 691,991.04/807.46
  6. Step 6: Final answer
    x = 857.00

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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.