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Finding the Fourth Proportional to 515.55, 710.52 and 390.54

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Solution

The fourth proportional to 515.55, 710.52 and 390.54 is: 538.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.55 : 710.52 = 390.54 : x
  2. Step 2: Convert to fraction form
    515.55/710.52 = 390.54/x
  3. Step 3: Cross multiply
    515.55x = 710.52 × 390.54
  4. Step 4: Simplify right side
    515.55x = 277,486.48
  5. Step 5: Solve for x
    x = 277,486.48/515.55
  6. Step 6: Final answer
    x = 538.23

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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.