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Finding the Fourth Proportional to 487.10, 730.66 and 256.45

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Solution

The fourth proportional to 487.10, 730.66 and 256.45 is: 384.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.10 : 730.66 = 256.45 : x
  2. Step 2: Convert to fraction form
    487.10/730.66 = 256.45/x
  3. Step 3: Cross multiply
    487.10x = 730.66 × 256.45
  4. Step 4: Simplify right side
    487.10x = 187,377.76
  5. Step 5: Solve for x
    x = 187,377.76/487.10
  6. Step 6: Final answer
    x = 384.68

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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.