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Finding the Fourth Proportional to 1,326.51, 1,987.37 and 740.81

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Solution

The fourth proportional to 1,326.51, 1,987.37 and 740.81 is: 1,109.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.51 : 1,987.37 = 740.81 : x
  2. Step 2: Convert to fraction form
    1,326.51/1,987.37 = 740.81/x
  3. Step 3: Cross multiply
    1,326.51x = 1,987.37 × 740.81
  4. Step 4: Simplify right side
    1,326.51x = 1,472,267.61
  5. Step 5: Solve for x
    x = 1,472,267.61/1,326.51
  6. Step 6: Final answer
    x = 1,109.88

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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.