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Finding the Fourth Proportional to 712.50, 1,068.75 and 256.50

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Solution

The fourth proportional to 712.50, 1,068.75 and 256.50 is: 384.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.50 : 1,068.75 = 256.50 : x
  2. Step 2: Convert to fraction form
    712.50/1,068.75 = 256.50/x
  3. Step 3: Cross multiply
    712.50x = 1,068.75 × 256.50
  4. Step 4: Simplify right side
    712.50x = 274,134.38
  5. Step 5: Solve for x
    x = 274,134.38/712.50
  6. Step 6: Final answer
    x = 384.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.