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Finding the Fourth Proportional to 3,280.68, 4,920.66 and 972

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Solution

The fourth proportional to 3,280.68, 4,920.66 and 972 is: 1,457.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,280.68 : 4,920.66 = 972 : x
  2. Step 2: Convert to fraction form
    3,280.68/4,920.66 = 972/x
  3. Step 3: Cross multiply
    3,280.68x = 4,920.66 × 972
  4. Step 4: Simplify right side
    3,280.68x = 4,782,881.52
  5. Step 5: Solve for x
    x = 4,782,881.52/3,280.68
  6. Step 6: Final answer
    x = 1,457.89

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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.