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Finding the Fourth Proportional to 974.51, 1,458.10 and 921.76

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Solution

The fourth proportional to 974.51, 1,458.10 and 921.76 is: 1,379.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.51 : 1,458.10 = 921.76 : x
  2. Step 2: Convert to fraction form
    974.51/1,458.10 = 921.76/x
  3. Step 3: Cross multiply
    974.51x = 1,458.10 × 921.76
  4. Step 4: Simplify right side
    974.51x = 1,344,018.26
  5. Step 5: Solve for x
    x = 1,344,018.26/974.51
  6. Step 6: Final answer
    x = 1,379.17

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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.