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Finding the Fourth Proportional to 145.48, 216.98 and 143.05

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Solution

The fourth proportional to 145.48, 216.98 and 143.05 is: 213.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.48 : 216.98 = 143.05 : x
  2. Step 2: Convert to fraction form
    145.48/216.98 = 143.05/x
  3. Step 3: Cross multiply
    145.48x = 216.98 × 143.05
  4. Step 4: Simplify right side
    145.48x = 31,038.99
  5. Step 5: Solve for x
    x = 31,038.99/145.48
  6. Step 6: Final answer
    x = 213.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.