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Finding the Fourth Proportional to 992.76, 1,369.92 and 573.12

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Solution

The fourth proportional to 992.76, 1,369.92 and 573.12 is: 790.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.76 : 1,369.92 = 573.12 : x
  2. Step 2: Convert to fraction form
    992.76/1,369.92 = 573.12/x
  3. Step 3: Cross multiply
    992.76x = 1,369.92 × 573.12
  4. Step 4: Simplify right side
    992.76x = 785,128.55
  5. Step 5: Solve for x
    x = 785,128.55/992.76
  6. Step 6: Final answer
    x = 790.85

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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.