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Finding the Fourth Proportional to 661.53, 909.93 and 585.39

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Solution

The fourth proportional to 661.53, 909.93 and 585.39 is: 805.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.53 : 909.93 = 585.39 : x
  2. Step 2: Convert to fraction form
    661.53/909.93 = 585.39/x
  3. Step 3: Cross multiply
    661.53x = 909.93 × 585.39
  4. Step 4: Simplify right side
    661.53x = 532,669.53
  5. Step 5: Solve for x
    x = 532,669.53/661.53
  6. Step 6: Final answer
    x = 805.20

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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.