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Finding the Fourth Proportional to 553,665.12, 764,007.72 and 311,987.04

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Solution

The fourth proportional to 553,665.12, 764,007.72 and 311,987.04 is: 430,513.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,665.12 : 764,007.72 = 311,987.04 : x
  2. Step 2: Convert to fraction form
    553,665.12/764,007.72 = 311,987.04/x
  3. Step 3: Cross multiply
    553,665.12x = 764,007.72 × 311,987.04
  4. Step 4: Simplify right side
    553,665.12x = 238,360,507,099.95
  5. Step 5: Solve for x
    x = 238,360,507,099.95/553,665.12
  6. Step 6: Final answer
    x = 430,513.86

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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.