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Finding the Fourth Proportional to 769.61, 1,154.05 and 256.25

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Solution

The fourth proportional to 769.61, 1,154.05 and 256.25 is: 384.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.61 : 1,154.05 = 256.25 : x
  2. Step 2: Convert to fraction form
    769.61/1,154.05 = 256.25/x
  3. Step 3: Cross multiply
    769.61x = 1,154.05 × 256.25
  4. Step 4: Simplify right side
    769.61x = 295,725.31
  5. Step 5: Solve for x
    x = 295,725.31/769.61
  6. Step 6: Final answer
    x = 384.25

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1.5x scale

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.