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Finding the Fourth Proportional to 1,543.90, 2,312.73 and 721.03

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Solution

The fourth proportional to 1,543.90, 2,312.73 and 721.03 is: 1,080.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,543.90 : 2,312.73 = 721.03 : x
  2. Step 2: Convert to fraction form
    1,543.90/2,312.73 = 721.03/x
  3. Step 3: Cross multiply
    1,543.90x = 2,312.73 × 721.03
  4. Step 4: Simplify right side
    1,543.90x = 1,667,547.71
  5. Step 5: Solve for x
    x = 1,667,547.71/1,543.90
  6. Step 6: Final answer
    x = 1,080.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.