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Finding the Fourth Proportional to 681.40, 939.18 and 570.52

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Solution

The fourth proportional to 681.40, 939.18 and 570.52 is: 786.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.40 : 939.18 = 570.52 : x
  2. Step 2: Convert to fraction form
    681.40/939.18 = 570.52/x
  3. Step 3: Cross multiply
    681.40x = 939.18 × 570.52
  4. Step 4: Simplify right side
    681.40x = 535,820.97
  5. Step 5: Solve for x
    x = 535,820.97/681.40
  6. Step 6: Final answer
    x = 786.35

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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.