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Finding the Fourth Proportional to 112,509.78, 155,268.32 and 61,519.47

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Solution

The fourth proportional to 112,509.78, 155,268.32 and 61,519.47 is: 84,899.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,509.78 : 155,268.32 = 61,519.47 : x
  2. Step 2: Convert to fraction form
    112,509.78/155,268.32 = 61,519.47/x
  3. Step 3: Cross multiply
    112,509.78x = 155,268.32 × 61,519.47
  4. Step 4: Simplify right side
    112,509.78x = 9,552,024,754.19
  5. Step 5: Solve for x
    x = 9,552,024,754.19/112,509.78
  6. Step 6: Final answer
    x = 84,899.51

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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.