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Finding the Fourth Proportional to 210.59, 290.70 and 145.43

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Solution

The fourth proportional to 210.59, 290.70 and 145.43 is: 200.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.59 : 290.70 = 145.43 : x
  2. Step 2: Convert to fraction form
    210.59/290.70 = 145.43/x
  3. Step 3: Cross multiply
    210.59x = 290.70 × 145.43
  4. Step 4: Simplify right side
    210.59x = 42,276.50
  5. Step 5: Solve for x
    x = 42,276.50/210.59
  6. Step 6: Final answer
    x = 200.75

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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.