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Finding the Fourth Proportional to 71.53, 98.70 and 47.00

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Solution

The fourth proportional to 71.53, 98.70 and 47.00 is: 64.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.53 : 98.70 = 47.00 : x
  2. Step 2: Convert to fraction form
    71.53/98.70 = 47.00/x
  3. Step 3: Cross multiply
    71.53x = 98.70 × 47.00
  4. Step 4: Simplify right side
    71.53x = 4,639.32
  5. Step 5: Solve for x
    x = 4,639.32/71.53
  6. Step 6: Final answer
    x = 64.86

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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.