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Finding the Fourth Proportional to 42.58, 64.00 and 35.40

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Solution

The fourth proportional to 42.58, 64.00 and 35.40 is: 53.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.58 : 64.00 = 35.40 : x
  2. Step 2: Convert to fraction form
    42.58/64.00 = 35.40/x
  3. Step 3: Cross multiply
    42.58x = 64.00 × 35.40
  4. Step 4: Simplify right side
    42.58x = 2,265.64
  5. Step 5: Solve for x
    x = 2,265.64/42.58
  6. Step 6: Final answer
    x = 53.21

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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.