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Finding the Fourth Proportional to 99.70, 149.47 and 56.34

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Solution

The fourth proportional to 99.70, 149.47 and 56.34 is: 84.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.70 : 149.47 = 56.34 : x
  2. Step 2: Convert to fraction form
    99.70/149.47 = 56.34/x
  3. Step 3: Cross multiply
    99.70x = 149.47 × 56.34
  4. Step 4: Simplify right side
    99.70x = 8,421.14
  5. Step 5: Solve for x
    x = 8,421.14/99.70
  6. Step 6: Final answer
    x = 84.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.