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Finding the Fourth Proportional to 928.11, 1,390.61 and 653.71

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Solution

The fourth proportional to 928.11, 1,390.61 and 653.71 is: 979.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.11 : 1,390.61 = 653.71 : x
  2. Step 2: Convert to fraction form
    928.11/1,390.61 = 653.71/x
  3. Step 3: Cross multiply
    928.11x = 1,390.61 × 653.71
  4. Step 4: Simplify right side
    928.11x = 909,053.82
  5. Step 5: Solve for x
    x = 909,053.82/928.11
  6. Step 6: Final answer
    x = 979.47

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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.