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Finding the Fourth Proportional to 970.07, 1,339.29 and 721.10

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Solution

The fourth proportional to 970.07, 1,339.29 and 721.10 is: 995.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.07 : 1,339.29 = 721.10 : x
  2. Step 2: Convert to fraction form
    970.07/1,339.29 = 721.10/x
  3. Step 3: Cross multiply
    970.07x = 1,339.29 × 721.10
  4. Step 4: Simplify right side
    970.07x = 965,762.02
  5. Step 5: Solve for x
    x = 965,762.02/970.07
  6. Step 6: Final answer
    x = 995.56

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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.