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Finding the Fourth Proportional to 765.81, 1,148.79 and 297.45

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Solution

The fourth proportional to 765.81, 1,148.79 and 297.45 is: 446.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.81 : 1,148.79 = 297.45 : x
  2. Step 2: Convert to fraction form
    765.81/1,148.79 = 297.45/x
  3. Step 3: Cross multiply
    765.81x = 1,148.79 × 297.45
  4. Step 4: Simplify right side
    765.81x = 341,707.59
  5. Step 5: Solve for x
    x = 341,707.59/765.81
  6. Step 6: Final answer
    x = 446.20

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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.