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Finding the Fourth Proportional to 137,761.60, 206,642.40 and 128,430.40

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Solution

The fourth proportional to 137,761.60, 206,642.40 and 128,430.40 is: 192,645.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,761.60 : 206,642.40 = 128,430.40 : x
  2. Step 2: Convert to fraction form
    137,761.60/206,642.40 = 128,430.40/x
  3. Step 3: Cross multiply
    137,761.60x = 206,642.40 × 128,430.40
  4. Step 4: Simplify right side
    137,761.60x = 26,539,166,088.96
  5. Step 5: Solve for x
    x = 26,539,166,088.96/137,761.60
  6. Step 6: Final answer
    x = 192,645.60

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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.