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Finding the Fourth Proportional to 386,066.80, 578,946.60 and 136,620.40

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Solution

The fourth proportional to 386,066.80, 578,946.60 and 136,620.40 is: 204,876.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,066.80 : 578,946.60 = 136,620.40 : x
  2. Step 2: Convert to fraction form
    386,066.80/578,946.60 = 136,620.40/x
  3. Step 3: Cross multiply
    386,066.80x = 578,946.60 × 136,620.40
  4. Step 4: Simplify right side
    386,066.80x = 79,095,916,070.64
  5. Step 5: Solve for x
    x = 79,095,916,070.64/386,066.80
  6. Step 6: Final answer
    x = 204,876.24

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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.