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Finding the Fourth Proportional to 228,718.26, 315,601.65 and 128,116.26

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Solution

The fourth proportional to 228,718.26, 315,601.65 and 128,116.26 is: 176,783.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,718.26 : 315,601.65 = 128,116.26 : x
  2. Step 2: Convert to fraction form
    228,718.26/315,601.65 = 128,116.26/x
  3. Step 3: Cross multiply
    228,718.26x = 315,601.65 × 128,116.26
  4. Step 4: Simplify right side
    228,718.26x = 40,433,703,047.83
  5. Step 5: Solve for x
    x = 40,433,703,047.83/228,718.26
  6. Step 6: Final answer
    x = 176,783.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.