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Finding the Fourth Proportional to 556.90, 835.40 and 520.90

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Solution

The fourth proportional to 556.90, 835.40 and 520.90 is: 781.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.90 : 835.40 = 520.90 : x
  2. Step 2: Convert to fraction form
    556.90/835.40 = 520.90/x
  3. Step 3: Cross multiply
    556.90x = 835.40 × 520.90
  4. Step 4: Simplify right side
    556.90x = 435,159.86
  5. Step 5: Solve for x
    x = 435,159.86/556.90
  6. Step 6: Final answer
    x = 781.40

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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.