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Finding the Fourth Proportional to 1,543.78, 2,130.42 and 845.20

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Solution

The fourth proportional to 1,543.78, 2,130.42 and 845.20 is: 1,166.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,543.78 : 2,130.42 = 845.20 : x
  2. Step 2: Convert to fraction form
    1,543.78/2,130.42 = 845.20/x
  3. Step 3: Cross multiply
    1,543.78x = 2,130.42 × 845.20
  4. Step 4: Simplify right side
    1,543.78x = 1,800,630.98
  5. Step 5: Solve for x
    x = 1,800,630.98/1,543.78
  6. Step 6: Final answer
    x = 1,166.38

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Find fourth proportional to 1,544.78, 2,131.80 and 846.20
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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.