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Finding the Fourth Proportional to 385.07, 530.75 and 286.79

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Solution

The fourth proportional to 385.07, 530.75 and 286.79 is: 395.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.07 : 530.75 = 286.79 : x
  2. Step 2: Convert to fraction form
    385.07/530.75 = 286.79/x
  3. Step 3: Cross multiply
    385.07x = 530.75 × 286.79
  4. Step 4: Simplify right side
    385.07x = 152,211.86
  5. Step 5: Solve for x
    x = 152,211.86/385.07
  6. Step 6: Final answer
    x = 395.29

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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.