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Finding the Fourth Proportional to 1,505.40, 2,077.39 and 842.13

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Solution

The fourth proportional to 1,505.40, 2,077.39 and 842.13 is: 1,162.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,505.40 : 2,077.39 = 842.13 : x
  2. Step 2: Convert to fraction form
    1,505.40/2,077.39 = 842.13/x
  3. Step 3: Cross multiply
    1,505.40x = 2,077.39 × 842.13
  4. Step 4: Simplify right side
    1,505.40x = 1,749,432.44
  5. Step 5: Solve for x
    x = 1,749,432.44/1,505.40
  6. Step 6: Final answer
    x = 1,162.10

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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.