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Finding the Fourth Proportional to 762.10, 1,051.70 and 412.79

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Solution

The fourth proportional to 762.10, 1,051.70 and 412.79 is: 569.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.10 : 1,051.70 = 412.79 : x
  2. Step 2: Convert to fraction form
    762.10/1,051.70 = 412.79/x
  3. Step 3: Cross multiply
    762.10x = 1,051.70 × 412.79
  4. Step 4: Simplify right side
    762.10x = 434,123.92
  5. Step 5: Solve for x
    x = 434,123.92/762.10
  6. Step 6: Final answer
    x = 569.64

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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.