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Finding the Fourth Proportional to 1,235.43, 1,702.55 and 885.51

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Solution

The fourth proportional to 1,235.43, 1,702.55 and 885.51 is: 1,220.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.43 : 1,702.55 = 885.51 : x
  2. Step 2: Convert to fraction form
    1,235.43/1,702.55 = 885.51/x
  3. Step 3: Cross multiply
    1,235.43x = 1,702.55 × 885.51
  4. Step 4: Simplify right side
    1,235.43x = 1,507,625.05
  5. Step 5: Solve for x
    x = 1,507,625.05/1,235.43
  6. Step 6: Final answer
    x = 1,220.32

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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.