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Finding the Fourth Proportional to 741.60, 1,021.95 and 711.63

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Solution

The fourth proportional to 741.60, 1,021.95 and 711.63 is: 980.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.60 : 1,021.95 = 711.63 : x
  2. Step 2: Convert to fraction form
    741.60/1,021.95 = 711.63/x
  3. Step 3: Cross multiply
    741.60x = 1,021.95 × 711.63
  4. Step 4: Simplify right side
    741.60x = 727,250.28
  5. Step 5: Solve for x
    x = 727,250.28/741.60
  6. Step 6: Final answer
    x = 980.65

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1.5x scale

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.