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Finding the Fourth Proportional to 86,919.30, 130,214.93 and 81,014.40

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Solution

The fourth proportional to 86,919.30, 130,214.93 and 81,014.40 is: 121,368.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,919.30 : 130,214.93 = 81,014.40 : x
  2. Step 2: Convert to fraction form
    86,919.30/130,214.93 = 81,014.40/x
  3. Step 3: Cross multiply
    86,919.30x = 130,214.93 × 81,014.40
  4. Step 4: Simplify right side
    86,919.30x = 10,549,284,019.92
  5. Step 5: Solve for x
    x = 10,549,284,019.92/86,919.30
  6. Step 6: Final answer
    x = 121,368.72

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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.