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Finding the Fourth Proportional to 386,145.60, 578,440.80 and 267,950.40

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Solution

The fourth proportional to 386,145.60, 578,440.80 and 267,950.40 is: 401,386.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,145.60 : 578,440.80 = 267,950.40 : x
  2. Step 2: Convert to fraction form
    386,145.60/578,440.80 = 267,950.40/x
  3. Step 3: Cross multiply
    386,145.60x = 578,440.80 × 267,950.40
  4. Step 4: Simplify right side
    386,145.60x = 154,993,443,736.32
  5. Step 5: Solve for x
    x = 154,993,443,736.32/386,145.60
  6. Step 6: Final answer
    x = 401,386.02

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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.