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Finding the Fourth Proportional to 975.54, 1,345.68 and 664.50

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Solution

The fourth proportional to 975.54, 1,345.68 and 664.50 is: 916.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.54 : 1,345.68 = 664.50 : x
  2. Step 2: Convert to fraction form
    975.54/1,345.68 = 664.50/x
  3. Step 3: Cross multiply
    975.54x = 1,345.68 × 664.50
  4. Step 4: Simplify right side
    975.54x = 894,204.36
  5. Step 5: Solve for x
    x = 894,204.36/975.54
  6. Step 6: Final answer
    x = 916.63

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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.