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Finding the Fourth Proportional to 660,415.60, 990,623.40 and 239,636.80

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Solution

The fourth proportional to 660,415.60, 990,623.40 and 239,636.80 is: 359,455.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,415.60 : 990,623.40 = 239,636.80 : x
  2. Step 2: Convert to fraction form
    660,415.60/990,623.40 = 239,636.80/x
  3. Step 3: Cross multiply
    660,415.60x = 990,623.40 × 239,636.80
  4. Step 4: Simplify right side
    660,415.60x = 237,389,821,581.12
  5. Step 5: Solve for x
    x = 237,389,821,581.12/660,415.60
  6. Step 6: Final answer
    x = 359,455.20

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1.5x scale

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.