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Finding the Fourth Proportional to 1,290.48, 1,780.20 and 848.40

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Solution

The fourth proportional to 1,290.48, 1,780.20 and 848.40 is: 1,170.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.48 : 1,780.20 = 848.40 : x
  2. Step 2: Convert to fraction form
    1,290.48/1,780.20 = 848.40/x
  3. Step 3: Cross multiply
    1,290.48x = 1,780.20 × 848.40
  4. Step 4: Simplify right side
    1,290.48x = 1,510,321.68
  5. Step 5: Solve for x
    x = 1,510,321.68/1,290.48
  6. Step 6: Final answer
    x = 1,170.36

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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.