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Finding the Fourth Proportional to 86,917.40, 130,376.10 and 69,421.40

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Solution

The fourth proportional to 86,917.40, 130,376.10 and 69,421.40 is: 104,132.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,917.40 : 130,376.10 = 69,421.40 : x
  2. Step 2: Convert to fraction form
    86,917.40/130,376.10 = 69,421.40/x
  3. Step 3: Cross multiply
    86,917.40x = 130,376.10 × 69,421.40
  4. Step 4: Simplify right side
    86,917.40x = 9,050,891,388.54
  5. Step 5: Solve for x
    x = 9,050,891,388.54/86,917.40
  6. Step 6: Final answer
    x = 104,132.10

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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.