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Finding the Fourth Proportional to 875.10, 1,207.65 and 543.51

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Solution

The fourth proportional to 875.10, 1,207.65 and 543.51 is: 750.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.10 : 1,207.65 = 543.51 : x
  2. Step 2: Convert to fraction form
    875.10/1,207.65 = 543.51/x
  3. Step 3: Cross multiply
    875.10x = 1,207.65 × 543.51
  4. Step 4: Simplify right side
    875.10x = 656,369.85
  5. Step 5: Solve for x
    x = 656,369.85/875.10
  6. Step 6: Final answer
    x = 750.05

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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.