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Finding the Fourth Proportional to 842.95, 1,264.96 and 409.87

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Solution

The fourth proportional to 842.95, 1,264.96 and 409.87 is: 615.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.95 : 1,264.96 = 409.87 : x
  2. Step 2: Convert to fraction form
    842.95/1,264.96 = 409.87/x
  3. Step 3: Cross multiply
    842.95x = 1,264.96 × 409.87
  4. Step 4: Simplify right side
    842.95x = 518,461.81
  5. Step 5: Solve for x
    x = 518,461.81/842.95
  6. Step 6: Final answer
    x = 615.06

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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.