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Finding the Fourth Proportional to 86,610.80, 129,851.40 and 47,212.40

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Solution

The fourth proportional to 86,610.80, 129,851.40 and 47,212.40 is: 70,783.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,610.80 : 129,851.40 = 47,212.40 : x
  2. Step 2: Convert to fraction form
    86,610.80/129,851.40 = 47,212.40/x
  3. Step 3: Cross multiply
    86,610.80x = 129,851.40 × 47,212.40
  4. Step 4: Simplify right side
    86,610.80x = 6,130,596,237.36
  5. Step 5: Solve for x
    x = 6,130,596,237.36/86,610.80
  6. Step 6: Final answer
    x = 70,783.28

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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.