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Finding the Fourth Proportional to 970.58, 1,337.03 and 721.46

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Solution

The fourth proportional to 970.58, 1,337.03 and 721.46 is: 993.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.58 : 1,337.03 = 721.46 : x
  2. Step 2: Convert to fraction form
    970.58/1,337.03 = 721.46/x
  3. Step 3: Cross multiply
    970.58x = 1,337.03 × 721.46
  4. Step 4: Simplify right side
    970.58x = 964,618.81
  5. Step 5: Solve for x
    x = 964,618.81/970.58
  6. Step 6: Final answer
    x = 993.86

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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.