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Finding the Fourth Proportional to 315,055.40, 472,611.90 and 128,028.20

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Solution

The fourth proportional to 315,055.40, 472,611.90 and 128,028.20 is: 192,054.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,055.40 : 472,611.90 = 128,028.20 : x
  2. Step 2: Convert to fraction form
    315,055.40/472,611.90 = 128,028.20/x
  3. Step 3: Cross multiply
    315,055.40x = 472,611.90 × 128,028.20
  4. Step 4: Simplify right side
    315,055.40x = 60,507,650,855.58
  5. Step 5: Solve for x
    x = 60,507,650,855.58/315,055.40
  6. Step 6: Final answer
    x = 192,054.00

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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.