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Finding the Fourth Proportional to 86,803.60, 130,291.80 and 42,480.40

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Solution

The fourth proportional to 86,803.60, 130,291.80 and 42,480.40 is: 63,762.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,803.60 : 130,291.80 = 42,480.40 : x
  2. Step 2: Convert to fraction form
    86,803.60/130,291.80 = 42,480.40/x
  3. Step 3: Cross multiply
    86,803.60x = 130,291.80 × 42,480.40
  4. Step 4: Simplify right side
    86,803.60x = 5,534,847,780.72
  5. Step 5: Solve for x
    x = 5,534,847,780.72/86,803.60
  6. Step 6: Final answer
    x = 63,762.88

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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.