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Finding the Fourth Proportional to 1,392.51, 1,921.74 and 763.02

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Solution

The fourth proportional to 1,392.51, 1,921.74 and 763.02 is: 1,053.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.51 : 1,921.74 = 763.02 : x
  2. Step 2: Convert to fraction form
    1,392.51/1,921.74 = 763.02/x
  3. Step 3: Cross multiply
    1,392.51x = 1,921.74 × 763.02
  4. Step 4: Simplify right side
    1,392.51x = 1,466,326.05
  5. Step 5: Solve for x
    x = 1,466,326.05/1,392.51
  6. Step 6: Final answer
    x = 1,053.01

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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.