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Finding the Fourth Proportional to 1,392.70, 1,921.96 and 763.26

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Solution

The fourth proportional to 1,392.70, 1,921.96 and 763.26 is: 1,053.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.70 : 1,921.96 = 763.26 : x
  2. Step 2: Convert to fraction form
    1,392.70/1,921.96 = 763.26/x
  3. Step 3: Cross multiply
    1,392.70x = 1,921.96 × 763.26
  4. Step 4: Simplify right side
    1,392.70x = 1,466,955.19
  5. Step 5: Solve for x
    x = 1,466,955.19/1,392.70
  6. Step 6: Final answer
    x = 1,053.32

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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.