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Finding the Fourth Proportional to 938.76, 1,407.36 and 573.48

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Solution

The fourth proportional to 938.76, 1,407.36 and 573.48 is: 859.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.76 : 1,407.36 = 573.48 : x
  2. Step 2: Convert to fraction form
    938.76/1,407.36 = 573.48/x
  3. Step 3: Cross multiply
    938.76x = 1,407.36 × 573.48
  4. Step 4: Simplify right side
    938.76x = 807,092.81
  5. Step 5: Solve for x
    x = 807,092.81/938.76
  6. Step 6: Final answer
    x = 859.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.