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Finding the Fourth Proportional to 1,317.60, 1,820.34 and 1,003.92

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Solution

The fourth proportional to 1,317.60, 1,820.34 and 1,003.92 is: 1,386.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.60 : 1,820.34 = 1,003.92 : x
  2. Step 2: Convert to fraction form
    1,317.60/1,820.34 = 1,003.92/x
  3. Step 3: Cross multiply
    1,317.60x = 1,820.34 × 1,003.92
  4. Step 4: Simplify right side
    1,317.60x = 1,827,475.73
  5. Step 5: Solve for x
    x = 1,827,475.73/1,317.60
  6. Step 6: Final answer
    x = 1,386.97

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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.