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Finding the Fourth Proportional to 661.20, 987.48 and 553.08

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Solution

The fourth proportional to 661.20, 987.48 and 553.08 is: 826.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.20 : 987.48 = 553.08 : x
  2. Step 2: Convert to fraction form
    661.20/987.48 = 553.08/x
  3. Step 3: Cross multiply
    661.20x = 987.48 × 553.08
  4. Step 4: Simplify right side
    661.20x = 546,155.44
  5. Step 5: Solve for x
    x = 546,155.44/661.20
  6. Step 6: Final answer
    x = 826.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.