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Finding the Fourth Proportional to 854.95, 1,281.55 and 649.09

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Solution

The fourth proportional to 854.95, 1,281.55 and 649.09 is: 972.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.95 : 1,281.55 = 649.09 : x
  2. Step 2: Convert to fraction form
    854.95/1,281.55 = 649.09/x
  3. Step 3: Cross multiply
    854.95x = 1,281.55 × 649.09
  4. Step 4: Simplify right side
    854.95x = 831,837.71
  5. Step 5: Solve for x
    x = 831,837.71/854.95
  6. Step 6: Final answer
    x = 972.96

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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.