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Finding the Fourth Proportional to 809.46, 1,117.04 and 455.45

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Solution

The fourth proportional to 809.46, 1,117.04 and 455.45 is: 628.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.46 : 1,117.04 = 455.45 : x
  2. Step 2: Convert to fraction form
    809.46/1,117.04 = 455.45/x
  3. Step 3: Cross multiply
    809.46x = 1,117.04 × 455.45
  4. Step 4: Simplify right side
    809.46x = 508,748.01
  5. Step 5: Solve for x
    x = 508,748.01/809.46
  6. Step 6: Final answer
    x = 628.50

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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.