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Finding the Fourth Proportional to 128,317.60, 192,480.80 and 39,570.40

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Solution

The fourth proportional to 128,317.60, 192,480.80 and 39,570.40 is: 59,356.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,317.60 : 192,480.80 = 39,570.40 : x
  2. Step 2: Convert to fraction form
    128,317.60/192,480.80 = 39,570.40/x
  3. Step 3: Cross multiply
    128,317.60x = 192,480.80 × 39,570.40
  4. Step 4: Simplify right side
    128,317.60x = 7,616,542,248.32
  5. Step 5: Solve for x
    x = 7,616,542,248.32/128,317.60
  6. Step 6: Final answer
    x = 59,356.96

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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.