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Finding the Fourth Proportional to 515.19, 710.87 and 318.75

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Solution

The fourth proportional to 515.19, 710.87 and 318.75 is: 439.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.19 : 710.87 = 318.75 : x
  2. Step 2: Convert to fraction form
    515.19/710.87 = 318.75/x
  3. Step 3: Cross multiply
    515.19x = 710.87 × 318.75
  4. Step 4: Simplify right side
    515.19x = 226,588.22
  5. Step 5: Solve for x
    x = 226,588.22/515.19
  6. Step 6: Final answer
    x = 439.81

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Find fourth proportional to 257.60, 355.43 and 159.38
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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.