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Finding the Fourth Proportional to 228,718.76, 315,602.34 and 128,116.76

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Solution

The fourth proportional to 228,718.76, 315,602.34 and 128,116.76 is: 176,784.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,718.76 : 315,602.34 = 128,116.76 : x
  2. Step 2: Convert to fraction form
    228,718.76/315,602.34 = 128,116.76/x
  3. Step 3: Cross multiply
    228,718.76x = 315,602.34 × 128,116.76
  4. Step 4: Simplify right side
    228,718.76x = 40,433,949,249.22
  5. Step 5: Solve for x
    x = 40,433,949,249.22/228,718.76
  6. Step 6: Final answer
    x = 176,784.58

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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.