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Finding the Fourth Proportional to 405,685.60, 608,528.40 and 139,422.40

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Solution

The fourth proportional to 405,685.60, 608,528.40 and 139,422.40 is: 209,133.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,685.60 : 608,528.40 = 139,422.40 : x
  2. Step 2: Convert to fraction form
    405,685.60/608,528.40 = 139,422.40/x
  3. Step 3: Cross multiply
    405,685.60x = 608,528.40 × 139,422.40
  4. Step 4: Simplify right side
    405,685.60x = 84,842,489,996.16
  5. Step 5: Solve for x
    x = 84,842,489,996.16/405,685.60
  6. Step 6: Final answer
    x = 209,133.60

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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.