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Finding the Fourth Proportional to 1,328.65, 1,835.08 and 885.78

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Solution

The fourth proportional to 1,328.65, 1,835.08 and 885.78 is: 1,223.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.65 : 1,835.08 = 885.78 : x
  2. Step 2: Convert to fraction form
    1,328.65/1,835.08 = 885.78/x
  3. Step 3: Cross multiply
    1,328.65x = 1,835.08 × 885.78
  4. Step 4: Simplify right side
    1,328.65x = 1,625,477.16
  5. Step 5: Solve for x
    x = 1,625,477.16/1,328.65
  6. Step 6: Final answer
    x = 1,223.41

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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.