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Finding the Fourth Proportional to 1,412.25, 1,948.92 and 782.79

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Solution

The fourth proportional to 1,412.25, 1,948.92 and 782.79 is: 1,080.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.25 : 1,948.92 = 782.79 : x
  2. Step 2: Convert to fraction form
    1,412.25/1,948.92 = 782.79/x
  3. Step 3: Cross multiply
    1,412.25x = 1,948.92 × 782.79
  4. Step 4: Simplify right side
    1,412.25x = 1,525,595.09
  5. Step 5: Solve for x
    x = 1,525,595.09/1,412.25
  6. Step 6: Final answer
    x = 1,080.26

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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.