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Finding the Fourth Proportional to 991.74, 1,366.71 and 711.48

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Solution

The fourth proportional to 991.74, 1,366.71 and 711.48 is: 980.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.74 : 1,366.71 = 711.48 : x
  2. Step 2: Convert to fraction form
    991.74/1,366.71 = 711.48/x
  3. Step 3: Cross multiply
    991.74x = 1,366.71 × 711.48
  4. Step 4: Simplify right side
    991.74x = 972,389.29
  5. Step 5: Solve for x
    x = 972,389.29/991.74
  6. Step 6: Final answer
    x = 980.48

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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.