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Finding the Fourth Proportional to 320.10, 477.59 and 285.45

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Solution

The fourth proportional to 320.10, 477.59 and 285.45 is: 425.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.10 : 477.59 = 285.45 : x
  2. Step 2: Convert to fraction form
    320.10/477.59 = 285.45/x
  3. Step 3: Cross multiply
    320.10x = 477.59 × 285.45
  4. Step 4: Simplify right side
    320.10x = 136,326.64
  5. Step 5: Solve for x
    x = 136,326.64/320.10
  6. Step 6: Final answer
    x = 425.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.