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Finding the Fourth Proportional to 1,323.19, 1,985.05 and 398.71

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Solution

The fourth proportional to 1,323.19, 1,985.05 and 398.71 is: 598.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.19 : 1,985.05 = 398.71 : x
  2. Step 2: Convert to fraction form
    1,323.19/1,985.05 = 398.71/x
  3. Step 3: Cross multiply
    1,323.19x = 1,985.05 × 398.71
  4. Step 4: Simplify right side
    1,323.19x = 791,449.98
  5. Step 5: Solve for x
    x = 791,449.98/1,323.19
  6. Step 6: Final answer
    x = 598.14

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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.