Home / 428,991.02-643,490.27-109,143.17

Finding the Fourth Proportional to 428,991.02, 643,490.27 and 109,143.17

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Solution

The fourth proportional to 428,991.02, 643,490.27 and 109,143.17 is: 163,715.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,991.02 : 643,490.27 = 109,143.17 : x
  2. Step 2: Convert to fraction form
    428,991.02/643,490.27 = 109,143.17/x
  3. Step 3: Cross multiply
    428,991.02x = 643,490.27 × 109,143.17
  4. Step 4: Simplify right side
    428,991.02x = 70,232,564,168.79
  5. Step 5: Solve for x
    x = 70,232,564,168.79/428,991.02
  6. Step 6: Final answer
    x = 163,715.70

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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.