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Finding the Fourth Proportional to 1,323.30, 1,985.43 and 621.13

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Solution

The fourth proportional to 1,323.30, 1,985.43 and 621.13 is: 931.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.30 : 1,985.43 = 621.13 : x
  2. Step 2: Convert to fraction form
    1,323.30/1,985.43 = 621.13/x
  3. Step 3: Cross multiply
    1,323.30x = 1,985.43 × 621.13
  4. Step 4: Simplify right side
    1,323.30x = 1,233,210.14
  5. Step 5: Solve for x
    x = 1,233,210.14/1,323.30
  6. Step 6: Final answer
    x = 931.92

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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.