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Finding the Fourth Proportional to 804.60, 1,112.42 and 618.71

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Solution

The fourth proportional to 804.60, 1,112.42 and 618.71 is: 855.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.60 : 1,112.42 = 618.71 : x
  2. Step 2: Convert to fraction form
    804.60/1,112.42 = 618.71/x
  3. Step 3: Cross multiply
    804.60x = 1,112.42 × 618.71
  4. Step 4: Simplify right side
    804.60x = 688,256.72
  5. Step 5: Solve for x
    x = 688,256.72/804.60
  6. Step 6: Final answer
    x = 855.40

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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.