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Finding the Fourth Proportional to 1,291.61, 1,783.28 and 992.32

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Solution

The fourth proportional to 1,291.61, 1,783.28 and 992.32 is: 1,370.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.61 : 1,783.28 = 992.32 : x
  2. Step 2: Convert to fraction form
    1,291.61/1,783.28 = 992.32/x
  3. Step 3: Cross multiply
    1,291.61x = 1,783.28 × 992.32
  4. Step 4: Simplify right side
    1,291.61x = 1,769,584.41
  5. Step 5: Solve for x
    x = 1,769,584.41/1,291.61
  6. Step 6: Final answer
    x = 1,370.06

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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.