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Finding the Fourth Proportional to 510.15, 703.95 and 289.05

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Solution

The fourth proportional to 510.15, 703.95 and 289.05 is: 398.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.15 : 703.95 = 289.05 : x
  2. Step 2: Convert to fraction form
    510.15/703.95 = 289.05/x
  3. Step 3: Cross multiply
    510.15x = 703.95 × 289.05
  4. Step 4: Simplify right side
    510.15x = 203,476.75
  5. Step 5: Solve for x
    x = 203,476.75/510.15
  6. Step 6: Final answer
    x = 398.86

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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.