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Finding the Fourth Proportional to 765.34, 1,056.82 and 486.07

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Solution

The fourth proportional to 765.34, 1,056.82 and 486.07 is: 671.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.34 : 1,056.82 = 486.07 : x
  2. Step 2: Convert to fraction form
    765.34/1,056.82 = 486.07/x
  3. Step 3: Cross multiply
    765.34x = 1,056.82 × 486.07
  4. Step 4: Simplify right side
    765.34x = 513,688.50
  5. Step 5: Solve for x
    x = 513,688.50/765.34
  6. Step 6: Final answer
    x = 671.19

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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.