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Finding the Fourth Proportional to 340.32, 507.12 and 318.72

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Solution

The fourth proportional to 340.32, 507.12 and 318.72 is: 474.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.32 : 507.12 = 318.72 : x
  2. Step 2: Convert to fraction form
    340.32/507.12 = 318.72/x
  3. Step 3: Cross multiply
    340.32x = 507.12 × 318.72
  4. Step 4: Simplify right side
    340.32x = 161,629.29
  5. Step 5: Solve for x
    x = 161,629.29/340.32
  6. Step 6: Final answer
    x = 474.93

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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.