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Finding the Fourth Proportional to 942.30, 1,412.90 and 479.78

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Solution

The fourth proportional to 942.30, 1,412.90 and 479.78 is: 719.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.30 : 1,412.90 = 479.78 : x
  2. Step 2: Convert to fraction form
    942.30/1,412.90 = 479.78/x
  3. Step 3: Cross multiply
    942.30x = 1,412.90 × 479.78
  4. Step 4: Simplify right side
    942.30x = 677,881.16
  5. Step 5: Solve for x
    x = 677,881.16/942.30
  6. Step 6: Final answer
    x = 719.39

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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.