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Finding the Fourth Proportional to 345.92, 476.15 and 313.11

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Solution

The fourth proportional to 345.92, 476.15 and 313.11 is: 430.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.92 : 476.15 = 313.11 : x
  2. Step 2: Convert to fraction form
    345.92/476.15 = 313.11/x
  3. Step 3: Cross multiply
    345.92x = 476.15 × 313.11
  4. Step 4: Simplify right side
    345.92x = 149,085.76
  5. Step 5: Solve for x
    x = 149,085.76/345.92
  6. Step 6: Final answer
    x = 430.99

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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.