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Finding the Fourth Proportional to 565.81, 780.60 and 355.90

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Solution

The fourth proportional to 565.81, 780.60 and 355.90 is: 491.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    565.81 : 780.60 = 355.90 : x
  2. Step 2: Convert to fraction form
    565.81/780.60 = 355.90/x
  3. Step 3: Cross multiply
    565.81x = 780.60 × 355.90
  4. Step 4: Simplify right side
    565.81x = 277,818.38
  5. Step 5: Solve for x
    x = 277,818.38/565.81
  6. Step 6: Final answer
    x = 491.01

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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.