Home / 128,988.36-178,041.08-78,001.20

Finding the Fourth Proportional to 128,988.36, 178,041.08 and 78,001.20

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Solution

The fourth proportional to 128,988.36, 178,041.08 and 78,001.20 is: 107,664.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,988.36 : 178,041.08 = 78,001.20 : x
  2. Step 2: Convert to fraction form
    128,988.36/178,041.08 = 78,001.20/x
  3. Step 3: Cross multiply
    128,988.36x = 178,041.08 × 78,001.20
  4. Step 4: Simplify right side
    128,988.36x = 13,887,417,889.30
  5. Step 5: Solve for x
    x = 13,887,417,889.30/128,988.36
  6. Step 6: Final answer
    x = 107,664.12

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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.