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Finding the Fourth Proportional to 1,509.92, 2,083.20 and 986.30

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Solution

The fourth proportional to 1,509.92, 2,083.20 and 986.30 is: 1,360.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,509.92 : 2,083.20 = 986.30 : x
  2. Step 2: Convert to fraction form
    1,509.92/2,083.20 = 986.30/x
  3. Step 3: Cross multiply
    1,509.92x = 2,083.20 × 986.30
  4. Step 4: Simplify right side
    1,509.92x = 2,054,660.16
  5. Step 5: Solve for x
    x = 2,054,660.16/1,509.92
  6. Step 6: Final answer
    x = 1,360.77

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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.