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Finding the Fourth Proportional to 86,978.40, 130,510.80 and 34,389.60

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Solution

The fourth proportional to 86,978.40, 130,510.80 and 34,389.60 is: 51,601.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,978.40 : 130,510.80 = 34,389.60 : x
  2. Step 2: Convert to fraction form
    86,978.40/130,510.80 = 34,389.60/x
  3. Step 3: Cross multiply
    86,978.40x = 130,510.80 × 34,389.60
  4. Step 4: Simplify right side
    86,978.40x = 4,488,214,207.68
  5. Step 5: Solve for x
    x = 4,488,214,207.68/86,978.40
  6. Step 6: Final answer
    x = 51,601.48

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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.