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Finding the Fourth Proportional to 47.35, 70.92 and 45.40

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Solution

The fourth proportional to 47.35, 70.92 and 45.40 is: 68.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.35 : 70.92 = 45.40 : x
  2. Step 2: Convert to fraction form
    47.35/70.92 = 45.40/x
  3. Step 3: Cross multiply
    47.35x = 70.92 × 45.40
  4. Step 4: Simplify right side
    47.35x = 3,219.77
  5. Step 5: Solve for x
    x = 3,219.77/47.35
  6. Step 6: Final answer
    x = 68.00

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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.