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Finding the Fourth Proportional to 809.54, 1,117.14 and 455.50

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Solution

The fourth proportional to 809.54, 1,117.14 and 455.50 is: 628.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.54 : 1,117.14 = 455.50 : x
  2. Step 2: Convert to fraction form
    809.54/1,117.14 = 455.50/x
  3. Step 3: Cross multiply
    809.54x = 1,117.14 × 455.50
  4. Step 4: Simplify right side
    809.54x = 508,859.52
  5. Step 5: Solve for x
    x = 508,859.52/809.54
  6. Step 6: Final answer
    x = 628.58

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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.