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Finding the Fourth Proportional to 661.57, 990.53 and 585.02

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Solution

The fourth proportional to 661.57, 990.53 and 585.02 is: 875.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.57 : 990.53 = 585.02 : x
  2. Step 2: Convert to fraction form
    661.57/990.53 = 585.02/x
  3. Step 3: Cross multiply
    661.57x = 990.53 × 585.02
  4. Step 4: Simplify right side
    661.57x = 579,481.61
  5. Step 5: Solve for x
    x = 579,481.61/661.57
  6. Step 6: Final answer
    x = 875.92

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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.