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Finding the Fourth Proportional to 260.66, 390.93 and 87.30

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Solution

The fourth proportional to 260.66, 390.93 and 87.30 is: 130.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.66 : 390.93 = 87.30 : x
  2. Step 2: Convert to fraction form
    260.66/390.93 = 87.30/x
  3. Step 3: Cross multiply
    260.66x = 390.93 × 87.30
  4. Step 4: Simplify right side
    260.66x = 34,128.19
  5. Step 5: Solve for x
    x = 34,128.19/260.66
  6. Step 6: Final answer
    x = 130.93

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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.