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Finding the Fourth Proportional to 929.42, 1,393.91 and 313.12

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Solution

The fourth proportional to 929.42, 1,393.91 and 313.12 is: 469.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.42 : 1,393.91 = 313.12 : x
  2. Step 2: Convert to fraction form
    929.42/1,393.91 = 313.12/x
  3. Step 3: Cross multiply
    929.42x = 1,393.91 × 313.12
  4. Step 4: Simplify right side
    929.42x = 436,454.61
  5. Step 5: Solve for x
    x = 436,454.61/929.42
  6. Step 6: Final answer
    x = 469.60

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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.