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Finding the Fourth Proportional to 1,280.58, 1,921.35 and 929.51

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Solution

The fourth proportional to 1,280.58, 1,921.35 and 929.51 is: 1,394.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.58 : 1,921.35 = 929.51 : x
  2. Step 2: Convert to fraction form
    1,280.58/1,921.35 = 929.51/x
  3. Step 3: Cross multiply
    1,280.58x = 1,921.35 × 929.51
  4. Step 4: Simplify right side
    1,280.58x = 1,785,915.12
  5. Step 5: Solve for x
    x = 1,785,915.12/1,280.58
  6. Step 6: Final answer
    x = 1,394.62

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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.