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Finding the Fourth Proportional to 385,343.60, 578,015.40 and 267,148.40

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Solution

The fourth proportional to 385,343.60, 578,015.40 and 267,148.40 is: 400,722.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,343.60 : 578,015.40 = 267,148.40 : x
  2. Step 2: Convert to fraction form
    385,343.60/578,015.40 = 267,148.40/x
  3. Step 3: Cross multiply
    385,343.60x = 578,015.40 × 267,148.40
  4. Step 4: Simplify right side
    385,343.60x = 154,415,889,285.36
  5. Step 5: Solve for x
    x = 154,415,889,285.36/385,343.60
  6. Step 6: Final answer
    x = 400,722.60

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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.