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Finding the Fourth Proportional to 1,323.78, 1,985.76 and 386.74

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Solution

The fourth proportional to 1,323.78, 1,985.76 and 386.74 is: 580.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.78 : 1,985.76 = 386.74 : x
  2. Step 2: Convert to fraction form
    1,323.78/1,985.76 = 386.74/x
  3. Step 3: Cross multiply
    1,323.78x = 1,985.76 × 386.74
  4. Step 4: Simplify right side
    1,323.78x = 767,972.82
  5. Step 5: Solve for x
    x = 767,972.82/1,323.78
  6. Step 6: Final answer
    x = 580.14

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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.