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Finding the Fourth Proportional to 354,485.08, 530,478.58 and 221,428

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Solution

The fourth proportional to 354,485.08, 530,478.58 and 221,428 is: 331,361.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    354,485.08 : 530,478.58 = 221,428 : x
  2. Step 2: Convert to fraction form
    354,485.08/530,478.58 = 221,428/x
  3. Step 3: Cross multiply
    354,485.08x = 530,478.58 × 221,428
  4. Step 4: Simplify right side
    354,485.08x = 117,462,811,012.24
  5. Step 5: Solve for x
    x = 117,462,811,012.24/354,485.08
  6. Step 6: Final answer
    x = 331,361.79

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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.