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Finding the Fourth Proportional to 164, 245.76 and 87.02

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Solution

The fourth proportional to 164, 245.76 and 87.02 is: 130.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    164 : 245.76 = 87.02 : x
  2. Step 2: Convert to fraction form
    164/245.76 = 87.02/x
  3. Step 3: Cross multiply
    164x = 245.76 × 87.02
  4. Step 4: Simplify right side
    164x = 21,386.04
  5. Step 5: Solve for x
    x = 21,386.04/164
  6. Step 6: Final answer
    x = 130.40

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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.