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Finding the Fourth Proportional to 874.77, 1,309.40 and 640.00

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Solution

The fourth proportional to 874.77, 1,309.40 and 640.00 is: 957.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.77 : 1,309.40 = 640.00 : x
  2. Step 2: Convert to fraction form
    874.77/1,309.40 = 640.00/x
  3. Step 3: Cross multiply
    874.77x = 1,309.40 × 640.00
  4. Step 4: Simplify right side
    874.77x = 838,016.84
  5. Step 5: Solve for x
    x = 838,016.84/874.77
  6. Step 6: Final answer
    x = 957.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.