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Finding the Fourth Proportional to 660,394.40, 990,980.40 and 239,712.80

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Solution

The fourth proportional to 660,394.40, 990,980.40 and 239,712.80 is: 359,710.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,394.40 : 990,980.40 = 239,712.80 : x
  2. Step 2: Convert to fraction form
    660,394.40/990,980.40 = 239,712.80/x
  3. Step 3: Cross multiply
    660,394.40x = 990,980.40 × 239,712.80
  4. Step 4: Simplify right side
    660,394.40x = 237,550,686,429.12
  5. Step 5: Solve for x
    x = 237,550,686,429.12/660,394.40
  6. Step 6: Final answer
    x = 359,710.33

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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.