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Finding the Fourth Proportional to 130,439, 195,686.40 and 40,479.76

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Solution

The fourth proportional to 130,439, 195,686.40 and 40,479.76 is: 60,728.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,439 : 195,686.40 = 40,479.76 : x
  2. Step 2: Convert to fraction form
    130,439/195,686.40 = 40,479.76/x
  3. Step 3: Cross multiply
    130,439x = 195,686.40 × 40,479.76
  4. Step 4: Simplify right side
    130,439x = 7,921,338,507.26
  5. Step 5: Solve for x
    x = 7,921,338,507.26/130,439
  6. Step 6: Final answer
    x = 60,728.30

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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.