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Finding the Fourth Proportional to 210.99, 291.20 and 145.58

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Solution

The fourth proportional to 210.99, 291.20 and 145.58 is: 200.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.99 : 291.20 = 145.58 : x
  2. Step 2: Convert to fraction form
    210.99/291.20 = 145.58/x
  3. Step 3: Cross multiply
    210.99x = 291.20 × 145.58
  4. Step 4: Simplify right side
    210.99x = 42,390.71
  5. Step 5: Solve for x
    x = 42,390.71/210.99
  6. Step 6: Final answer
    x = 200.91

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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.