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Finding the Fourth Proportional to 854.63, 1,280.64 and 507.28

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Solution

The fourth proportional to 854.63, 1,280.64 and 507.28 is: 760.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.63 : 1,280.64 = 507.28 : x
  2. Step 2: Convert to fraction form
    854.63/1,280.64 = 507.28/x
  3. Step 3: Cross multiply
    854.63x = 1,280.64 × 507.28
  4. Step 4: Simplify right side
    854.63x = 649,643.06
  5. Step 5: Solve for x
    x = 649,643.06/854.63
  6. Step 6: Final answer
    x = 760.15

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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.