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Finding the Fourth Proportional to 811.52, 1,214.58 and 648.44

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Solution

The fourth proportional to 811.52, 1,214.58 and 648.44 is: 970.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.52 : 1,214.58 = 648.44 : x
  2. Step 2: Convert to fraction form
    811.52/1,214.58 = 648.44/x
  3. Step 3: Cross multiply
    811.52x = 1,214.58 × 648.44
  4. Step 4: Simplify right side
    811.52x = 787,582.26
  5. Step 5: Solve for x
    x = 787,582.26/811.52
  6. Step 6: Final answer
    x = 970.50

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1.5x scale

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.