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Finding the Fourth Proportional to 620.51, 853.13 and 553.50

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Solution

The fourth proportional to 620.51, 853.13 and 553.50 is: 761.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.51 : 853.13 = 553.50 : x
  2. Step 2: Convert to fraction form
    620.51/853.13 = 553.50/x
  3. Step 3: Cross multiply
    620.51x = 853.13 × 553.50
  4. Step 4: Simplify right side
    620.51x = 472,204.69
  5. Step 5: Solve for x
    x = 472,204.69/620.51
  6. Step 6: Final answer
    x = 761.00

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.