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Finding the Fourth Proportional to 904.79, 1,245.45 and 788.15

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Solution

The fourth proportional to 904.79, 1,245.45 and 788.15 is: 1,084.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.79 : 1,245.45 = 788.15 : x
  2. Step 2: Convert to fraction form
    904.79/1,245.45 = 788.15/x
  3. Step 3: Cross multiply
    904.79x = 1,245.45 × 788.15
  4. Step 4: Simplify right side
    904.79x = 981,607.49
  5. Step 5: Solve for x
    x = 981,607.49/904.79
  6. Step 6: Final answer
    x = 1,084.90

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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.