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Finding the Fourth Proportional to 875.60, 1,206.56 and 720.08

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Solution

The fourth proportional to 875.60, 1,206.56 and 720.08 is: 992.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.60 : 1,206.56 = 720.08 : x
  2. Step 2: Convert to fraction form
    875.60/1,206.56 = 720.08/x
  3. Step 3: Cross multiply
    875.60x = 1,206.56 × 720.08
  4. Step 4: Simplify right side
    875.60x = 868,819.72
  5. Step 5: Solve for x
    x = 868,819.72/875.60
  6. Step 6: Final answer
    x = 992.26

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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.