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Finding the Fourth Proportional to 804.10, 1,109.10 and 647.10

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Solution

The fourth proportional to 804.10, 1,109.10 and 647.10 is: 892.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.10 : 1,109.10 = 647.10 : x
  2. Step 2: Convert to fraction form
    804.10/1,109.10 = 647.10/x
  3. Step 3: Cross multiply
    804.10x = 1,109.10 × 647.10
  4. Step 4: Simplify right side
    804.10x = 717,698.61
  5. Step 5: Solve for x
    x = 717,698.61/804.10
  6. Step 6: Final answer
    x = 892.55

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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.