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Finding the Fourth Proportional to 128,142.95, 176,920.47 and 114,690.87

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Solution

The fourth proportional to 128,142.95, 176,920.47 and 114,690.87 is: 158,347.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,142.95 : 176,920.47 = 114,690.87 : x
  2. Step 2: Convert to fraction form
    128,142.95/176,920.47 = 114,690.87/x
  3. Step 3: Cross multiply
    128,142.95x = 176,920.47 × 114,690.87
  4. Step 4: Simplify right side
    128,142.95x = 20,291,162,625.11
  5. Step 5: Solve for x
    x = 20,291,162,625.11/128,142.95
  6. Step 6: Final answer
    x = 158,347.87

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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.