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Finding the Fourth Proportional to 1,409.65, 1,945.86 and 885.58

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Solution

The fourth proportional to 1,409.65, 1,945.86 and 885.58 is: 1,222.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.65 : 1,945.86 = 885.58 : x
  2. Step 2: Convert to fraction form
    1,409.65/1,945.86 = 885.58/x
  3. Step 3: Cross multiply
    1,409.65x = 1,945.86 × 885.58
  4. Step 4: Simplify right side
    1,409.65x = 1,723,206.51
  5. Step 5: Solve for x
    x = 1,723,206.51/1,409.65
  6. Step 6: Final answer
    x = 1,222.44

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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.