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Finding the Fourth Proportional to 1,666.40, 2,499.60 and 512.16

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Solution

The fourth proportional to 1,666.40, 2,499.60 and 512.16 is: 768.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,666.40 : 2,499.60 = 512.16 : x
  2. Step 2: Convert to fraction form
    1,666.40/2,499.60 = 512.16/x
  3. Step 3: Cross multiply
    1,666.40x = 2,499.60 × 512.16
  4. Step 4: Simplify right side
    1,666.40x = 1,280,195.14
  5. Step 5: Solve for x
    x = 1,280,195.14/1,666.40
  6. Step 6: Final answer
    x = 768.24

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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.