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Finding the Fourth Proportional to 975.12, 1,345.05 and 680.28

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Solution

The fourth proportional to 975.12, 1,345.05 and 680.28 is: 938.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.12 : 1,345.05 = 680.28 : x
  2. Step 2: Convert to fraction form
    975.12/1,345.05 = 680.28/x
  3. Step 3: Cross multiply
    975.12x = 1,345.05 × 680.28
  4. Step 4: Simplify right side
    975.12x = 915,010.61
  5. Step 5: Solve for x
    x = 915,010.61/975.12
  6. Step 6: Final answer
    x = 938.36

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1.5x scale

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.