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Finding the Fourth Proportional to 804.76, 1,109.57 and 647.39

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Solution

The fourth proportional to 804.76, 1,109.57 and 647.39 is: 892.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.76 : 1,109.57 = 647.39 : x
  2. Step 2: Convert to fraction form
    804.76/1,109.57 = 647.39/x
  3. Step 3: Cross multiply
    804.76x = 1,109.57 × 647.39
  4. Step 4: Simplify right side
    804.76x = 718,328.91
  5. Step 5: Solve for x
    x = 718,328.91/804.76
  6. Step 6: Final answer
    x = 892.60

Related Problems

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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.