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Finding the Fourth Proportional to 765.54, 1,056.78 and 486

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Solution

The fourth proportional to 765.54, 1,056.78 and 486 is: 670.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.54 : 1,056.78 = 486 : x
  2. Step 2: Convert to fraction form
    765.54/1,056.78 = 486/x
  3. Step 3: Cross multiply
    765.54x = 1,056.78 × 486
  4. Step 4: Simplify right side
    765.54x = 513,595.08
  5. Step 5: Solve for x
    x = 513,595.08/765.54
  6. Step 6: Final answer
    x = 670.89

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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.