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Finding the Fourth Proportional to 128,985.87, 178,005.60 and 74,536.23

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Solution

The fourth proportional to 128,985.87, 178,005.60 and 74,536.23 is: 102,862.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,985.87 : 178,005.60 = 74,536.23 : x
  2. Step 2: Convert to fraction form
    128,985.87/178,005.60 = 74,536.23/x
  3. Step 3: Cross multiply
    128,985.87x = 178,005.60 × 74,536.23
  4. Step 4: Simplify right side
    128,985.87x = 13,267,866,342.89
  5. Step 5: Solve for x
    x = 13,267,866,342.89/128,985.87
  6. Step 6: Final answer
    x = 102,862.94

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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.