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Finding the Fourth Proportional to 209,411.20, 314,116.80 and 125,430.40

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Solution

The fourth proportional to 209,411.20, 314,116.80 and 125,430.40 is: 188,145.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,411.20 : 314,116.80 = 125,430.40 : x
  2. Step 2: Convert to fraction form
    209,411.20/314,116.80 = 125,430.40/x
  3. Step 3: Cross multiply
    209,411.20x = 314,116.80 × 125,430.40
  4. Step 4: Simplify right side
    209,411.20x = 39,399,795,870.72
  5. Step 5: Solve for x
    x = 39,399,795,870.72/209,411.20
  6. Step 6: Final answer
    x = 188,145.60

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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.