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Finding the Fourth Proportional to 888.02, 1,221.40 and 712.98

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Solution

The fourth proportional to 888.02, 1,221.40 and 712.98 is: 980.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.02 : 1,221.40 = 712.98 : x
  2. Step 2: Convert to fraction form
    888.02/1,221.40 = 712.98/x
  3. Step 3: Cross multiply
    888.02x = 1,221.40 × 712.98
  4. Step 4: Simplify right side
    888.02x = 870,833.77
  5. Step 5: Solve for x
    x = 870,833.77/888.02
  6. Step 6: Final answer
    x = 980.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.