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Finding the Fourth Proportional to 514.62, 711.12 and 390.08

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Solution

The fourth proportional to 514.62, 711.12 and 390.08 is: 539.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.62 : 711.12 = 390.08 : x
  2. Step 2: Convert to fraction form
    514.62/711.12 = 390.08/x
  3. Step 3: Cross multiply
    514.62x = 711.12 × 390.08
  4. Step 4: Simplify right side
    514.62x = 277,390.13
  5. Step 5: Solve for x
    x = 277,390.13/514.62
  6. Step 6: Final answer
    x = 539.02

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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.