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Finding the Fourth Proportional to 858.65, 1,290.03 and 551.11

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Solution

The fourth proportional to 858.65, 1,290.03 and 551.11 is: 827.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.65 : 1,290.03 = 551.11 : x
  2. Step 2: Convert to fraction form
    858.65/1,290.03 = 551.11/x
  3. Step 3: Cross multiply
    858.65x = 1,290.03 × 551.11
  4. Step 4: Simplify right side
    858.65x = 710,941.98
  5. Step 5: Solve for x
    x = 710,941.98/858.65
  6. Step 6: Final answer
    x = 827.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.