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Finding the Fourth Proportional to 809.95, 1,117.55 and 478.19

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Solution

The fourth proportional to 809.95, 1,117.55 and 478.19 is: 659.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.95 : 1,117.55 = 478.19 : x
  2. Step 2: Convert to fraction form
    809.95/1,117.55 = 478.19/x
  3. Step 3: Cross multiply
    809.95x = 1,117.55 × 478.19
  4. Step 4: Simplify right side
    809.95x = 534,403.73
  5. Step 5: Solve for x
    x = 534,403.73/809.95
  6. Step 6: Final answer
    x = 659.80

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Double scale
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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.