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Finding the Fourth Proportional to 761.79, 1,051.26 and 412.47

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Solution

The fourth proportional to 761.79, 1,051.26 and 412.47 is: 569.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.79 : 1,051.26 = 412.47 : x
  2. Step 2: Convert to fraction form
    761.79/1,051.26 = 412.47/x
  3. Step 3: Cross multiply
    761.79x = 1,051.26 × 412.47
  4. Step 4: Simplify right side
    761.79x = 433,613.21
  5. Step 5: Solve for x
    x = 433,613.21/761.79
  6. Step 6: Final answer
    x = 569.20

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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.