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Finding the Fourth Proportional to 1,283.30, 1,924.94 and 821.30

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Solution

The fourth proportional to 1,283.30, 1,924.94 and 821.30 is: 1,231.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.30 : 1,924.94 = 821.30 : x
  2. Step 2: Convert to fraction form
    1,283.30/1,924.94 = 821.30/x
  3. Step 3: Cross multiply
    1,283.30x = 1,924.94 × 821.30
  4. Step 4: Simplify right side
    1,283.30x = 1,580,953.22
  5. Step 5: Solve for x
    x = 1,580,953.22/1,283.30
  6. Step 6: Final answer
    x = 1,231.94

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1.5x scale

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.