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Finding the Fourth Proportional to 1,330.72, 1,994.88 and 508.76

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Solution

The fourth proportional to 1,330.72, 1,994.88 and 508.76 is: 762.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.72 : 1,994.88 = 508.76 : x
  2. Step 2: Convert to fraction form
    1,330.72/1,994.88 = 508.76/x
  3. Step 3: Cross multiply
    1,330.72x = 1,994.88 × 508.76
  4. Step 4: Simplify right side
    1,330.72x = 1,014,915.15
  5. Step 5: Solve for x
    x = 1,014,915.15/1,330.72
  6. Step 6: Final answer
    x = 762.68

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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.