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Finding the Fourth Proportional to 128,114.90, 176,785.06 and 74,389.40

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Solution

The fourth proportional to 128,114.90, 176,785.06 and 74,389.40 is: 102,649.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,114.90 : 176,785.06 = 74,389.40 : x
  2. Step 2: Convert to fraction form
    128,114.90/176,785.06 = 74,389.40/x
  3. Step 3: Cross multiply
    128,114.90x = 176,785.06 × 74,389.40
  4. Step 4: Simplify right side
    128,114.90x = 13,150,934,542.36
  5. Step 5: Solve for x
    x = 13,150,934,542.36/128,114.90
  6. Step 6: Final answer
    x = 102,649.53

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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.