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Finding the Fourth Proportional to 970.16, 1,338.62 and 571.73

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Solution

The fourth proportional to 970.16, 1,338.62 and 571.73 is: 788.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.16 : 1,338.62 = 571.73 : x
  2. Step 2: Convert to fraction form
    970.16/1,338.62 = 571.73/x
  3. Step 3: Cross multiply
    970.16x = 1,338.62 × 571.73
  4. Step 4: Simplify right side
    970.16x = 765,319.66
  5. Step 5: Solve for x
    x = 765,319.66/970.16
  6. Step 6: Final answer
    x = 788.86

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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.