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Finding the Fourth Proportional to 64.02, 88.70 and 62.80

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Solution

The fourth proportional to 64.02, 88.70 and 62.80 is: 87.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.02 : 88.70 = 62.80 : x
  2. Step 2: Convert to fraction form
    64.02/88.70 = 62.80/x
  3. Step 3: Cross multiply
    64.02x = 88.70 × 62.80
  4. Step 4: Simplify right side
    64.02x = 5,570.05
  5. Step 5: Solve for x
    x = 5,570.05/64.02
  6. Step 6: Final answer
    x = 87.00

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.