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Finding the Fourth Proportional to 923.12, 1,272.76 and 573.20

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Solution

The fourth proportional to 923.12, 1,272.76 and 573.20 is: 790.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.12 : 1,272.76 = 573.20 : x
  2. Step 2: Convert to fraction form
    923.12/1,272.76 = 573.20/x
  3. Step 3: Cross multiply
    923.12x = 1,272.76 × 573.20
  4. Step 4: Simplify right side
    923.12x = 729,539.67
  5. Step 5: Solve for x
    x = 729,539.67/923.12
  6. Step 6: Final answer
    x = 790.30

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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.