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Finding the Fourth Proportional to 555.90, 835.70 and 553.20

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Solution

The fourth proportional to 555.90, 835.70 and 553.20 is: 831.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.90 : 835.70 = 553.20 : x
  2. Step 2: Convert to fraction form
    555.90/835.70 = 553.20/x
  3. Step 3: Cross multiply
    555.90x = 835.70 × 553.20
  4. Step 4: Simplify right side
    555.90x = 462,309.24
  5. Step 5: Solve for x
    x = 462,309.24/555.90
  6. Step 6: Final answer
    x = 831.64

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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.