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Finding the Fourth Proportional to 974.52, 1,345.08 and 664

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Solution

The fourth proportional to 974.52, 1,345.08 and 664 is: 916.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.52 : 1,345.08 = 664 : x
  2. Step 2: Convert to fraction form
    974.52/1,345.08 = 664/x
  3. Step 3: Cross multiply
    974.52x = 1,345.08 × 664
  4. Step 4: Simplify right side
    974.52x = 893,133.12
  5. Step 5: Solve for x
    x = 893,133.12/974.52
  6. Step 6: Final answer
    x = 916.49

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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.