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Finding the Fourth Proportional to 970.72, 1,340.08 and 708.64

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Solution

The fourth proportional to 970.72, 1,340.08 and 708.64 is: 978.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.72 : 1,340.08 = 708.64 : x
  2. Step 2: Convert to fraction form
    970.72/1,340.08 = 708.64/x
  3. Step 3: Cross multiply
    970.72x = 1,340.08 × 708.64
  4. Step 4: Simplify right side
    970.72x = 949,634.29
  5. Step 5: Solve for x
    x = 949,634.29/970.72
  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.