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Finding the Fourth Proportional to 975.12, 1,345.20 and 709.15

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Solution

The fourth proportional to 975.12, 1,345.20 and 709.15 is: 978.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.12 : 1,345.20 = 709.15 : x
  2. Step 2: Convert to fraction form
    975.12/1,345.20 = 709.15/x
  3. Step 3: Cross multiply
    975.12x = 1,345.20 × 709.15
  4. Step 4: Simplify right side
    975.12x = 953,945.03
  5. Step 5: Solve for x
    x = 953,945.03/975.12
  6. Step 6: Final answer
    x = 978.28

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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.