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Finding the Fourth Proportional to 1,309.34, 1,808.30 and 813.16

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Solution

The fourth proportional to 1,309.34, 1,808.30 and 813.16 is: 1,123.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.34 : 1,808.30 = 813.16 : x
  2. Step 2: Convert to fraction form
    1,309.34/1,808.30 = 813.16/x
  3. Step 3: Cross multiply
    1,309.34x = 1,808.30 × 813.16
  4. Step 4: Simplify right side
    1,309.34x = 1,470,424.12
  5. Step 5: Solve for x
    x = 1,470,424.12/1,309.34
  6. Step 6: Final answer
    x = 1,123.03

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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.