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Finding the Fourth Proportional to 806.78, 1,113.45 and 457.49

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Solution

The fourth proportional to 806.78, 1,113.45 and 457.49 is: 631.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.78 : 1,113.45 = 457.49 : x
  2. Step 2: Convert to fraction form
    806.78/1,113.45 = 457.49/x
  3. Step 3: Cross multiply
    806.78x = 1,113.45 × 457.49
  4. Step 4: Simplify right side
    806.78x = 509,392.24
  5. Step 5: Solve for x
    x = 509,392.24/806.78
  6. Step 6: Final answer
    x = 631.39

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Half scale
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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.