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Finding the Fourth Proportional to 389.47, 537.58 and 256.79

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Solution

The fourth proportional to 389.47, 537.58 and 256.79 is: 354.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.47 : 537.58 = 256.79 : x
  2. Step 2: Convert to fraction form
    389.47/537.58 = 256.79/x
  3. Step 3: Cross multiply
    389.47x = 537.58 × 256.79
  4. Step 4: Simplify right side
    389.47x = 138,041.20
  5. Step 5: Solve for x
    x = 138,041.20/389.47
  6. Step 6: Final answer
    x = 354.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.