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Finding the Fourth Proportional to 1,323.54, 1,985.17 and 398.89

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Solution

The fourth proportional to 1,323.54, 1,985.17 and 398.89 is: 598.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.54 : 1,985.17 = 398.89 : x
  2. Step 2: Convert to fraction form
    1,323.54/1,985.17 = 398.89/x
  3. Step 3: Cross multiply
    1,323.54x = 1,985.17 × 398.89
  4. Step 4: Simplify right side
    1,323.54x = 791,858.50
  5. Step 5: Solve for x
    x = 791,858.50/1,323.54
  6. Step 6: Final answer
    x = 598.29

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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.