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Finding the Fourth Proportional to 557.90, 838.70 and 555.20

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Solution

The fourth proportional to 557.90, 838.70 and 555.20 is: 834.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.90 : 838.70 = 555.20 : x
  2. Step 2: Convert to fraction form
    557.90/838.70 = 555.20/x
  3. Step 3: Cross multiply
    557.90x = 838.70 × 555.20
  4. Step 4: Simplify right side
    557.90x = 465,646.24
  5. Step 5: Solve for x
    x = 465,646.24/557.90
  6. Step 6: Final answer
    x = 834.64

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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.