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Finding the Fourth Proportional to 1,543.32, 2,129.90 and 880.40

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Solution

The fourth proportional to 1,543.32, 2,129.90 and 880.40 is: 1,215.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,543.32 : 2,129.90 = 880.40 : x
  2. Step 2: Convert to fraction form
    1,543.32/2,129.90 = 880.40/x
  3. Step 3: Cross multiply
    1,543.32x = 2,129.90 × 880.40
  4. Step 4: Simplify right side
    1,543.32x = 1,875,164.88
  5. Step 5: Solve for x
    x = 1,875,164.88/1,543.32
  6. Step 6: Final answer
    x = 1,215.02

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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.