Home / 129,678.51-178,957.12-72,321.47

Finding the Fourth Proportional to 129,678.51, 178,957.12 and 72,321.47

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Solution

The fourth proportional to 129,678.51, 178,957.12 and 72,321.47 is: 99,804.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,678.51 : 178,957.12 = 72,321.47 : x
  2. Step 2: Convert to fraction form
    129,678.51/178,957.12 = 72,321.47/x
  3. Step 3: Cross multiply
    129,678.51x = 178,957.12 × 72,321.47
  4. Step 4: Simplify right side
    129,678.51x = 12,942,441,985.37
  5. Step 5: Solve for x
    x = 12,942,441,985.37/129,678.51
  6. Step 6: Final answer
    x = 99,804.06

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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.