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Finding the Fourth Proportional to 145.51, 200.72 and 90.30

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Solution

The fourth proportional to 145.51, 200.72 and 90.30 is: 124.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.51 : 200.72 = 90.30 : x
  2. Step 2: Convert to fraction form
    145.51/200.72 = 90.30/x
  3. Step 3: Cross multiply
    145.51x = 200.72 × 90.30
  4. Step 4: Simplify right side
    145.51x = 18,125.02
  5. Step 5: Solve for x
    x = 18,125.02/145.51
  6. Step 6: Final answer
    x = 124.56

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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.