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Finding the Fourth Proportional to 346.61, 478.37 and 317.45

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Solution

The fourth proportional to 346.61, 478.37 and 317.45 is: 438.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.61 : 478.37 = 317.45 : x
  2. Step 2: Convert to fraction form
    346.61/478.37 = 317.45/x
  3. Step 3: Cross multiply
    346.61x = 478.37 × 317.45
  4. Step 4: Simplify right side
    346.61x = 151,858.56
  5. Step 5: Solve for x
    x = 151,858.56/346.61
  6. Step 6: Final answer
    x = 438.13

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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.