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Finding the Fourth Proportional to 459.28, 689.28 and 253.99

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Solution

The fourth proportional to 459.28, 689.28 and 253.99 is: 381.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.28 : 689.28 = 253.99 : x
  2. Step 2: Convert to fraction form
    459.28/689.28 = 253.99/x
  3. Step 3: Cross multiply
    459.28x = 689.28 × 253.99
  4. Step 4: Simplify right side
    459.28x = 175,070.23
  5. Step 5: Solve for x
    x = 175,070.23/459.28
  6. Step 6: Final answer
    x = 381.18

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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.