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Finding the Fourth Proportional to 86,703.40, 130,055.10 and 80,871.40

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Solution

The fourth proportional to 86,703.40, 130,055.10 and 80,871.40 is: 121,307.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,703.40 : 130,055.10 = 80,871.40 : x
  2. Step 2: Convert to fraction form
    86,703.40/130,055.10 = 80,871.40/x
  3. Step 3: Cross multiply
    86,703.40x = 130,055.10 × 80,871.40
  4. Step 4: Simplify right side
    86,703.40x = 10,517,738,014.14
  5. Step 5: Solve for x
    x = 10,517,738,014.14/86,703.40
  6. Step 6: Final answer
    x = 121,307.10

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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.