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Finding the Fourth Proportional to 808.70, 1,215.45 and 703.10

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Solution

The fourth proportional to 808.70, 1,215.45 and 703.10 is: 1,056.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.70 : 1,215.45 = 703.10 : x
  2. Step 2: Convert to fraction form
    808.70/1,215.45 = 703.10/x
  3. Step 3: Cross multiply
    808.70x = 1,215.45 × 703.10
  4. Step 4: Simplify right side
    808.70x = 854,582.90
  5. Step 5: Solve for x
    x = 854,582.90/808.70
  6. Step 6: Final answer
    x = 1,056.74

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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.