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Finding the Fourth Proportional to 620.19, 857.51 and 542.37

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Solution

The fourth proportional to 620.19, 857.51 and 542.37 is: 749.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.19 : 857.51 = 542.37 : x
  2. Step 2: Convert to fraction form
    620.19/857.51 = 542.37/x
  3. Step 3: Cross multiply
    620.19x = 857.51 × 542.37
  4. Step 4: Simplify right side
    620.19x = 465,084.99
  5. Step 5: Solve for x
    x = 465,084.99/620.19
  6. Step 6: Final answer
    x = 749.91

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1.5x scale

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.