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Finding the Fourth Proportional to 892.95, 1,339.40 and 405.66

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Solution

The fourth proportional to 892.95, 1,339.40 and 405.66 is: 608.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.95 : 1,339.40 = 405.66 : x
  2. Step 2: Convert to fraction form
    892.95/1,339.40 = 405.66/x
  3. Step 3: Cross multiply
    892.95x = 1,339.40 × 405.66
  4. Step 4: Simplify right side
    892.95x = 543,341.00
  5. Step 5: Solve for x
    x = 543,341.00/892.95
  6. Step 6: Final answer
    x = 608.48

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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.