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Finding the Fourth Proportional to 565.18, 780.71 and 442.40

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Solution

The fourth proportional to 565.18, 780.71 and 442.40 is: 611.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    565.18 : 780.71 = 442.40 : x
  2. Step 2: Convert to fraction form
    565.18/780.71 = 442.40/x
  3. Step 3: Cross multiply
    565.18x = 780.71 × 442.40
  4. Step 4: Simplify right side
    565.18x = 345,379.99
  5. Step 5: Solve for x
    x = 345,379.99/565.18
  6. Step 6: Final answer
    x = 611.10

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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.