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Finding the Fourth Proportional to 990.01, 1,366.16 and 580.85

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Solution

The fourth proportional to 990.01, 1,366.16 and 580.85 is: 801.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.01 : 1,366.16 = 580.85 : x
  2. Step 2: Convert to fraction form
    990.01/1,366.16 = 580.85/x
  3. Step 3: Cross multiply
    990.01x = 1,366.16 × 580.85
  4. Step 4: Simplify right side
    990.01x = 793,534.04
  5. Step 5: Solve for x
    x = 793,534.04/990.01
  6. Step 6: Final answer
    x = 801.54

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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.