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Finding the Fourth Proportional to 1,050.60, 1,568.32 and 921

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Solution

The fourth proportional to 1,050.60, 1,568.32 and 921 is: 1,374.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,050.60 : 1,568.32 = 921 : x
  2. Step 2: Convert to fraction form
    1,050.60/1,568.32 = 921/x
  3. Step 3: Cross multiply
    1,050.60x = 1,568.32 × 921
  4. Step 4: Simplify right side
    1,050.60x = 1,444,422.72
  5. Step 5: Solve for x
    x = 1,444,422.72/1,050.60
  6. Step 6: Final answer
    x = 1,374.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.