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Finding the Fourth Proportional to 459.70, 689.55 and 400.30

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Solution

The fourth proportional to 459.70, 689.55 and 400.30 is: 600.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.70 : 689.55 = 400.30 : x
  2. Step 2: Convert to fraction form
    459.70/689.55 = 400.30/x
  3. Step 3: Cross multiply
    459.70x = 689.55 × 400.30
  4. Step 4: Simplify right side
    459.70x = 276,026.87
  5. Step 5: Solve for x
    x = 276,026.87/459.70
  6. Step 6: Final answer
    x = 600.45

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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.