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Finding the Fourth Proportional to 975.29, 1,345.32 and 660.51

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Solution

The fourth proportional to 975.29, 1,345.32 and 660.51 is: 911.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.29 : 1,345.32 = 660.51 : x
  2. Step 2: Convert to fraction form
    975.29/1,345.32 = 660.51/x
  3. Step 3: Cross multiply
    975.29x = 1,345.32 × 660.51
  4. Step 4: Simplify right side
    975.29x = 888,597.31
  5. Step 5: Solve for x
    x = 888,597.31/975.29
  6. Step 6: Final answer
    x = 911.12

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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.