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Finding the Fourth Proportional to 568.07, 783.90 and 319.40

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Solution

The fourth proportional to 568.07, 783.90 and 319.40 is: 440.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.07 : 783.90 = 319.40 : x
  2. Step 2: Convert to fraction form
    568.07/783.90 = 319.40/x
  3. Step 3: Cross multiply
    568.07x = 783.90 × 319.40
  4. Step 4: Simplify right side
    568.07x = 250,373.74
  5. Step 5: Solve for x
    x = 250,373.74/568.07
  6. Step 6: Final answer
    x = 440.75

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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.