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Finding the Fourth Proportional to 145.77, 200.95 and 90.47

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Solution

The fourth proportional to 145.77, 200.95 and 90.47 is: 124.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.77 : 200.95 = 90.47 : x
  2. Step 2: Convert to fraction form
    145.77/200.95 = 90.47/x
  3. Step 3: Cross multiply
    145.77x = 200.95 × 90.47
  4. Step 4: Simplify right side
    145.77x = 18,179.95
  5. Step 5: Solve for x
    x = 18,179.95/145.77
  6. Step 6: Final answer
    x = 124.72

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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.