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Finding the Fourth Proportional to 957.35, 1,320.41 and 642.51

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Solution

The fourth proportional to 957.35, 1,320.41 and 642.51 is: 886.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.35 : 1,320.41 = 642.51 : x
  2. Step 2: Convert to fraction form
    957.35/1,320.41 = 642.51/x
  3. Step 3: Cross multiply
    957.35x = 1,320.41 × 642.51
  4. Step 4: Simplify right side
    957.35x = 848,373.42
  5. Step 5: Solve for x
    x = 848,373.42/957.35
  6. Step 6: Final answer
    x = 886.17

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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.