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Finding the Fourth Proportional to 970.08, 1,339.30 and 721.10

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Solution

The fourth proportional to 970.08, 1,339.30 and 721.10 is: 995.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.08 : 1,339.30 = 721.10 : x
  2. Step 2: Convert to fraction form
    970.08/1,339.30 = 721.10/x
  3. Step 3: Cross multiply
    970.08x = 1,339.30 × 721.10
  4. Step 4: Simplify right side
    970.08x = 965,769.23
  5. Step 5: Solve for x
    x = 965,769.23/970.08
  6. Step 6: Final answer
    x = 995.56

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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.