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Finding the Fourth Proportional to 854.60, 1,282.08 and 507.80

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Solution

The fourth proportional to 854.60, 1,282.08 and 507.80 is: 761.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.60 : 1,282.08 = 507.80 : x
  2. Step 2: Convert to fraction form
    854.60/1,282.08 = 507.80/x
  3. Step 3: Cross multiply
    854.60x = 1,282.08 × 507.80
  4. Step 4: Simplify right side
    854.60x = 651,040.22
  5. Step 5: Solve for x
    x = 651,040.22/854.60
  6. Step 6: Final answer
    x = 761.81

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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.