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Finding the Fourth Proportional to 405,207.20, 607,810.80 and 124,810.40

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Solution

The fourth proportional to 405,207.20, 607,810.80 and 124,810.40 is: 187,215.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,207.20 : 607,810.80 = 124,810.40 : x
  2. Step 2: Convert to fraction form
    405,207.20/607,810.80 = 124,810.40/x
  3. Step 3: Cross multiply
    405,207.20x = 607,810.80 × 124,810.40
  4. Step 4: Simplify right side
    405,207.20x = 75,861,109,072.32
  5. Step 5: Solve for x
    x = 75,861,109,072.32/405,207.20
  6. Step 6: Final answer
    x = 187,215.60

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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.