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Finding the Fourth Proportional to 86,810.40, 130,258.80 and 49,399.20

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Solution

The fourth proportional to 86,810.40, 130,258.80 and 49,399.20 is: 74,123.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,810.40 : 130,258.80 = 49,399.20 : x
  2. Step 2: Convert to fraction form
    86,810.40/130,258.80 = 49,399.20/x
  3. Step 3: Cross multiply
    86,810.40x = 130,258.80 × 49,399.20
  4. Step 4: Simplify right side
    86,810.40x = 6,434,680,512.96
  5. Step 5: Solve for x
    x = 6,434,680,512.96/86,810.40
  6. Step 6: Final answer
    x = 74,123.38

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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.