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Finding the Fourth Proportional to 929.10, 1,393.50 and 312.78

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Solution

The fourth proportional to 929.10, 1,393.50 and 312.78 is: 469.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.10 : 1,393.50 = 312.78 : x
  2. Step 2: Convert to fraction form
    929.10/1,393.50 = 312.78/x
  3. Step 3: Cross multiply
    929.10x = 1,393.50 × 312.78
  4. Step 4: Simplify right side
    929.10x = 435,858.93
  5. Step 5: Solve for x
    x = 435,858.93/929.10
  6. Step 6: Final answer
    x = 469.12

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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.