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Finding the Fourth Proportional to 515.04, 711.70 and 390.48

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Solution

The fourth proportional to 515.04, 711.70 and 390.48 is: 539.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.04 : 711.70 = 390.48 : x
  2. Step 2: Convert to fraction form
    515.04/711.70 = 390.48/x
  3. Step 3: Cross multiply
    515.04x = 711.70 × 390.48
  4. Step 4: Simplify right side
    515.04x = 277,904.62
  5. Step 5: Solve for x
    x = 277,904.62/515.04
  6. Step 6: Final answer
    x = 539.58

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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.