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Finding the Fourth Proportional to 957.13, 1,319.61 and 641.89

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Solution

The fourth proportional to 957.13, 1,319.61 and 641.89 is: 884.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.13 : 1,319.61 = 641.89 : x
  2. Step 2: Convert to fraction form
    957.13/1,319.61 = 641.89/x
  3. Step 3: Cross multiply
    957.13x = 1,319.61 × 641.89
  4. Step 4: Simplify right side
    957.13x = 847,048.52
  5. Step 5: Solve for x
    x = 847,048.52/957.13
  6. Step 6: Final answer
    x = 884.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.