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Finding the Fourth Proportional to 71.99, 99.36 and 45.77

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Solution

The fourth proportional to 71.99, 99.36 and 45.77 is: 63.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.99 : 99.36 = 45.77 : x
  2. Step 2: Convert to fraction form
    71.99/99.36 = 45.77/x
  3. Step 3: Cross multiply
    71.99x = 99.36 × 45.77
  4. Step 4: Simplify right side
    71.99x = 4,547.21
  5. Step 5: Solve for x
    x = 4,547.21/71.99
  6. Step 6: Final answer
    x = 63.17

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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.