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Finding the Fourth Proportional to 388,956.96, 583,084.80 and 139,580.64

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Solution

The fourth proportional to 388,956.96, 583,084.80 and 139,580.64 is: 209,245.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,956.96 : 583,084.80 = 139,580.64 : x
  2. Step 2: Convert to fraction form
    388,956.96/583,084.80 = 139,580.64/x
  3. Step 3: Cross multiply
    388,956.96x = 583,084.80 × 139,580.64
  4. Step 4: Simplify right side
    388,956.96x = 81,387,349,558.27
  5. Step 5: Solve for x
    x = 81,387,349,558.27/388,956.96
  6. Step 6: Final answer
    x = 209,245.13

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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.