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Finding the Fourth Proportional to 390,079.20, 585,118.80 and 180,127.20

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Solution

The fourth proportional to 390,079.20, 585,118.80 and 180,127.20 is: 270,190.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,079.20 : 585,118.80 = 180,127.20 : x
  2. Step 2: Convert to fraction form
    390,079.20/585,118.80 = 180,127.20/x
  3. Step 3: Cross multiply
    390,079.20x = 585,118.80 × 180,127.20
  4. Step 4: Simplify right side
    390,079.20x = 105,395,811,111.36
  5. Step 5: Solve for x
    x = 105,395,811,111.36/390,079.20
  6. Step 6: Final answer
    x = 270,190.80

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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.