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Finding the Fourth Proportional to 854.79, 1,280.56 and 507.39

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Solution

The fourth proportional to 854.79, 1,280.56 and 507.39 is: 760.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.79 : 1,280.56 = 507.39 : x
  2. Step 2: Convert to fraction form
    854.79/1,280.56 = 507.39/x
  3. Step 3: Cross multiply
    854.79x = 1,280.56 × 507.39
  4. Step 4: Simplify right side
    854.79x = 649,743.34
  5. Step 5: Solve for x
    x = 649,743.34/854.79
  6. Step 6: Final answer
    x = 760.12

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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.