Home / 1,638.80-2,456.40-945.80

Finding the Fourth Proportional to 1,638.80, 2,456.40 and 945.80

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Solution

The fourth proportional to 1,638.80, 2,456.40 and 945.80 is: 1,417.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.80 : 2,456.40 = 945.80 : x
  2. Step 2: Convert to fraction form
    1,638.80/2,456.40 = 945.80/x
  3. Step 3: Cross multiply
    1,638.80x = 2,456.40 × 945.80
  4. Step 4: Simplify right side
    1,638.80x = 2,323,263.12
  5. Step 5: Solve for x
    x = 2,323,263.12/1,638.80
  6. Step 6: Final answer
    x = 1,417.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.