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Finding the Fourth Proportional to 1,543.68, 2,128.84 and 983.16

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Solution

The fourth proportional to 1,543.68, 2,128.84 and 983.16 is: 1,355.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,543.68 : 2,128.84 = 983.16 : x
  2. Step 2: Convert to fraction form
    1,543.68/2,128.84 = 983.16/x
  3. Step 3: Cross multiply
    1,543.68x = 2,128.84 × 983.16
  4. Step 4: Simplify right side
    1,543.68x = 2,092,990.33
  5. Step 5: Solve for x
    x = 2,092,990.33/1,543.68
  6. Step 6: Final answer
    x = 1,355.84

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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.