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Finding the Fourth Proportional to 947.93, 1,421.29 and 654.61

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Solution

The fourth proportional to 947.93, 1,421.29 and 654.61 is: 981.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.93 : 1,421.29 = 654.61 : x
  2. Step 2: Convert to fraction form
    947.93/1,421.29 = 654.61/x
  3. Step 3: Cross multiply
    947.93x = 1,421.29 × 654.61
  4. Step 4: Simplify right side
    947.93x = 930,390.65
  5. Step 5: Solve for x
    x = 930,390.65/947.93
  6. Step 6: Final answer
    x = 981.50

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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.