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Finding the Fourth Proportional to 581.90, 868.58 and 505.40

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Solution

The fourth proportional to 581.90, 868.58 and 505.40 is: 754.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.90 : 868.58 = 505.40 : x
  2. Step 2: Convert to fraction form
    581.90/868.58 = 505.40/x
  3. Step 3: Cross multiply
    581.90x = 868.58 × 505.40
  4. Step 4: Simplify right side
    581.90x = 438,975.36
  5. Step 5: Solve for x
    x = 438,975.36/581.90
  6. Step 6: Final answer
    x = 754.39

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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.