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Finding the Fourth Proportional to 345.84, 515.55 and 319.92

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Solution

The fourth proportional to 345.84, 515.55 and 319.92 is: 476.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.84 : 515.55 = 319.92 : x
  2. Step 2: Convert to fraction form
    345.84/515.55 = 319.92/x
  3. Step 3: Cross multiply
    345.84x = 515.55 × 319.92
  4. Step 4: Simplify right side
    345.84x = 164,934.76
  5. Step 5: Solve for x
    x = 164,934.76/345.84
  6. Step 6: Final answer
    x = 476.91

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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.