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Finding the Fourth Proportional to 957.15, 1,320.42 and 603.21

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Solution

The fourth proportional to 957.15, 1,320.42 and 603.21 is: 832.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.15 : 1,320.42 = 603.21 : x
  2. Step 2: Convert to fraction form
    957.15/1,320.42 = 603.21/x
  3. Step 3: Cross multiply
    957.15x = 1,320.42 × 603.21
  4. Step 4: Simplify right side
    957.15x = 796,490.55
  5. Step 5: Solve for x
    x = 796,490.55/957.15
  6. Step 6: Final answer
    x = 832.15

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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.