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Finding the Fourth Proportional to 1,138.32, 1,570.73 and 783.54

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Solution

The fourth proportional to 1,138.32, 1,570.73 and 783.54 is: 1,081.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.32 : 1,570.73 = 783.54 : x
  2. Step 2: Convert to fraction form
    1,138.32/1,570.73 = 783.54/x
  3. Step 3: Cross multiply
    1,138.32x = 1,570.73 × 783.54
  4. Step 4: Simplify right side
    1,138.32x = 1,230,725.87
  5. Step 5: Solve for x
    x = 1,230,725.87/1,138.32
  6. Step 6: Final answer
    x = 1,081.18

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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.