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Finding the Fourth Proportional to 102.40, 153.32 and 56.68

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Solution

The fourth proportional to 102.40, 153.32 and 56.68 is: 84.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.40 : 153.32 = 56.68 : x
  2. Step 2: Convert to fraction form
    102.40/153.32 = 56.68/x
  3. Step 3: Cross multiply
    102.40x = 153.32 × 56.68
  4. Step 4: Simplify right side
    102.40x = 8,689.51
  5. Step 5: Solve for x
    x = 8,689.51/102.40
  6. Step 6: Final answer
    x = 84.86

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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.