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Finding the Fourth Proportional to 927.01, 1,390.75 and 653.64

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Solution

The fourth proportional to 927.01, 1,390.75 and 653.64 is: 980.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.01 : 1,390.75 = 653.64 : x
  2. Step 2: Convert to fraction form
    927.01/1,390.75 = 653.64/x
  3. Step 3: Cross multiply
    927.01x = 1,390.75 × 653.64
  4. Step 4: Simplify right side
    927.01x = 909,039.61
  5. Step 5: Solve for x
    x = 909,039.61/927.01
  6. Step 6: Final answer
    x = 980.61

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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.