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Finding the Fourth Proportional to 111,931.78, 154,465.50 and 61,630.78

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Solution

The fourth proportional to 111,931.78, 154,465.50 and 61,630.78 is: 85,050.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,931.78 : 154,465.50 = 61,630.78 : x
  2. Step 2: Convert to fraction form
    111,931.78/154,465.50 = 61,630.78/x
  3. Step 3: Cross multiply
    111,931.78x = 154,465.50 × 61,630.78
  4. Step 4: Simplify right side
    111,931.78x = 9,519,829,248.09
  5. Step 5: Solve for x
    x = 9,519,829,248.09/111,931.78
  6. Step 6: Final answer
    x = 85,050.28

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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.