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Finding the Fourth Proportional to 64.18, 88.47 and 55.40

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Solution

The fourth proportional to 64.18, 88.47 and 55.40 is: 76.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.18 : 88.47 = 55.40 : x
  2. Step 2: Convert to fraction form
    64.18/88.47 = 55.40/x
  3. Step 3: Cross multiply
    64.18x = 88.47 × 55.40
  4. Step 4: Simplify right side
    64.18x = 4,901.24
  5. Step 5: Solve for x
    x = 4,901.24/64.18
  6. Step 6: Final answer
    x = 76.37

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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.