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Finding the Fourth Proportional to 1,290.67, 1,935.62 and 366.30

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Solution

The fourth proportional to 1,290.67, 1,935.62 and 366.30 is: 549.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.67 : 1,935.62 = 366.30 : x
  2. Step 2: Convert to fraction form
    1,290.67/1,935.62 = 366.30/x
  3. Step 3: Cross multiply
    1,290.67x = 1,935.62 × 366.30
  4. Step 4: Simplify right side
    1,290.67x = 709,024.41
  5. Step 5: Solve for x
    x = 709,024.41/1,290.67
  6. Step 6: Final answer
    x = 549.35

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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.