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Finding the Fourth Proportional to 970.98, 1,339.56 and 722.46

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Solution

The fourth proportional to 970.98, 1,339.56 and 722.46 is: 996.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.98 : 1,339.56 = 722.46 : x
  2. Step 2: Convert to fraction form
    970.98/1,339.56 = 722.46/x
  3. Step 3: Cross multiply
    970.98x = 1,339.56 × 722.46
  4. Step 4: Simplify right side
    970.98x = 967,778.52
  5. Step 5: Solve for x
    x = 967,778.52/970.98
  6. Step 6: Final answer
    x = 996.70

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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.