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Finding the Fourth Proportional to 128,017.80, 192,026.70 and 81,323.40

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Solution

The fourth proportional to 128,017.80, 192,026.70 and 81,323.40 is: 121,985.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,017.80 : 192,026.70 = 81,323.40 : x
  2. Step 2: Convert to fraction form
    128,017.80/192,026.70 = 81,323.40/x
  3. Step 3: Cross multiply
    128,017.80x = 192,026.70 × 81,323.40
  4. Step 4: Simplify right side
    128,017.80x = 15,616,264,134.78
  5. Step 5: Solve for x
    x = 15,616,264,134.78/128,017.80
  6. Step 6: Final answer
    x = 121,985.10

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1.5x scale

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.