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Finding the Fourth Proportional to 970.79, 1,339.38 and 572.36

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Solution

The fourth proportional to 970.79, 1,339.38 and 572.36 is: 789.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.79 : 1,339.38 = 572.36 : x
  2. Step 2: Convert to fraction form
    970.79/1,339.38 = 572.36/x
  3. Step 3: Cross multiply
    970.79x = 1,339.38 × 572.36
  4. Step 4: Simplify right side
    970.79x = 766,600.84
  5. Step 5: Solve for x
    x = 766,600.84/970.79
  6. Step 6: Final answer
    x = 789.67

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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.