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Finding the Fourth Proportional to 1,129.31, 1,688.40 and 957.89

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Solution

The fourth proportional to 1,129.31, 1,688.40 and 957.89 is: 1,432.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.31 : 1,688.40 = 957.89 : x
  2. Step 2: Convert to fraction form
    1,129.31/1,688.40 = 957.89/x
  3. Step 3: Cross multiply
    1,129.31x = 1,688.40 × 957.89
  4. Step 4: Simplify right side
    1,129.31x = 1,617,293.03
  5. Step 5: Solve for x
    x = 1,617,293.03/1,129.31
  6. Step 6: Final answer
    x = 1,432.11

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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.