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Finding the Fourth Proportional to 315,060.40, 472,619.40 and 128,033.20

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Solution

The fourth proportional to 315,060.40, 472,619.40 and 128,033.20 is: 192,061.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,060.40 : 472,619.40 = 128,033.20 : x
  2. Step 2: Convert to fraction form
    315,060.40/472,619.40 = 128,033.20/x
  3. Step 3: Cross multiply
    315,060.40x = 472,619.40 × 128,033.20
  4. Step 4: Simplify right side
    315,060.40x = 60,510,974,164.08
  5. Step 5: Solve for x
    x = 60,510,974,164.08/315,060.40
  6. Step 6: Final answer
    x = 192,061.50

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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.