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Finding the Fourth Proportional to 56,981.04, 78,638.42 and 31,489.64

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Solution

The fourth proportional to 56,981.04, 78,638.42 and 31,489.64 is: 43,458.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,981.04 : 78,638.42 = 31,489.64 : x
  2. Step 2: Convert to fraction form
    56,981.04/78,638.42 = 31,489.64/x
  3. Step 3: Cross multiply
    56,981.04x = 78,638.42 × 31,489.64
  4. Step 4: Simplify right side
    56,981.04x = 2,476,295,535.97
  5. Step 5: Solve for x
    x = 2,476,295,535.97/56,981.04
  6. Step 6: Final answer
    x = 43,458.24

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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.