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Finding the Fourth Proportional to 515.66, 711.40 and 294.58

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Solution

The fourth proportional to 515.66, 711.40 and 294.58 is: 406.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.66 : 711.40 = 294.58 : x
  2. Step 2: Convert to fraction form
    515.66/711.40 = 294.58/x
  3. Step 3: Cross multiply
    515.66x = 711.40 × 294.58
  4. Step 4: Simplify right side
    515.66x = 209,559.18
  5. Step 5: Solve for x
    x = 209,559.18/515.66
  6. Step 6: Final answer
    x = 406.39

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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.